Saf-T-Liner HDX Saf-T-Liner EF Minotour Conventional/FS65 Student Guide TBB 2003 Thomas Body PCB Electrical
Jan 27, 2016
Saf-T-Liner HDX
Saf-T-Liner EF
Minotour
Conventional/FS65
Student Guide
TBB 2003
Thomas Body
PCB Electrical
Thomas Body Electrical TBB2003
Course Objectives
• understanding of printed circuit boards
• read and understand Thomas schematics
• identify body harness routing
• understand chassis-body interface
• follow troubleshooting procedure
• access service publications and info
Thomas Body PCB Electrical TBB2003
Course Content:
1. Printed Circuit Boards
2. Battery, Ignition, Ground
3. Wiring
4. Understanding Thomas Drawings
5. School Bus Options
6. Service Publications
7. Evaluation 8. Reference
Thomas Body PCB Electrical
Section
1
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-2
Minotour Conventional
Saf-T-Liner HDX Saf-T-Liner EF
Thomas Body PCB Electrical
Page 1-3
Printed Circuit Boards
This electrical system was designed by market,AMPs, and option demand.Make a list of consumers found in every bus
____________________________ ____________________________ ____________________________ ____________________________ ____________________________
it makes sense to control these consumers by the same device and in the same area on every bus
Make a list of consumers by market
School Transit Chick ________ _________ __________________ _________ __________ These consumers would also be controlled by a common device mount in the same area
Thomas Body PCB Electrical
Page 1-4
Printed Circuit Boards Initial Production Configuration
• Began in production with 2000 model Type D “New Look” pushers
Thomas Body PCB Electrical
Page 1-5
Conventional/FS65, Saf-T-Liner HDX
•Conventional/FS65 new external access April, 2003
• New Look Pusher started 2000 ER-Transit MVP-ER HD HDX
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-6
MVP-EFStarted 2004
MinotourStarted 2005
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-7
How many amps is required to provide power to a typical bus body?_________
The rear box pictured above from ER-Transit model
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-8
Printed Circuit Boards
• non-conductive platform with printed circuit paths• non-repairable component
Front side of B2 is pictured
Thomas Body PCB Electrical TBB2003
Page 1-9
Printed Circuit Boards
reference Drawing# 52004770
AMP Load Capacity
List examples of circuits for each load:
1 amp ________________________
5 amp ________________________
15 amp _______________________
30 amp _______________________
Thomas Body PCB Electrical
Page 1-10
Printed Circuit Boards
4 buss bars for parallel circuits
Thomas Body PCB Electrical
Page 1-11
Printed Circuit Boards
How many large cables connect to
B1_____
B2_____
4 internal buss bars but 2 cables?
Thomas Body Electrical TBB2003
Page 1-12
Printed Circuit Boards
What is role
of diodes
D5_________
D6_________
D7_________
Thomas Body Electrical TBB2003
Page 1-13
Printed Circuit Boards
LED lightsHave 1000 ohmResistors/diodes
Why?
Diodes installedBetween D6Ignition & GroundD3 between Switched Power& Ground
Where is the bias?
See Drawing 52004770 & 52005370
Thomas Body PCB Electrical
Page 1-14
Relay#3 LED#4
Hands-on Activity#1
LED#29
LED#4 tells me___________________________LED#29 tells me__________________________
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-15
Hands On Activity#1 using LED lights
Complaint: front dome lights are inop
Are front dome lights a body or chassis option?___________
Are front dome lights an option found on all busesor just school buses?___________
Which PCB will control this option?___________
Locate the decal on the service compartment doorfor B#1What relay controls the front dome lights?___________
Printed Circuit Boards
Thomas Body PCB Electrical
Page 1-16
Hands-on Activity #2
R&R both PCB Board#1 and #2
What tools are required to remove?________________________________________
Remember to first disconnect the batteries
Thomas Body PCB Electrical
Page 1-17
Hands-on Activity#3
You will need a DVOM
With the ignition key in the on position Remove P5-B1 and locate circuit LT174 yellowAt pin 8
Test the circuit for voltage__________
Disconnect the flasher or flasher fuse at the chassis
Test the circuit for voltage__________
Reinstall P5-B1 and flasher fuse and remove P4-B1
Test circuit LT10 yellow for voltage_____
Reinstall P4-B1 and remove P29-B1
Test circuit LT174 yellow for voltage_______
Thomas Body Electrical TBB2003
Page 1-18
Hands-on Activity #4
You will need a DVOM
Disconnect P5-B1 and locate circuit LB172 red
Test the circuit for voltage__________
Step on the service brake and test voltage
See LED#31 amber
Re-connect P5-B1 and disconnect P4-B1
Test voltage at pins 3 and 8 red/white wire
Depress service brake and test voltage ____
Thomas Body PCB Electrical
Section 2
Battery, Ignition, and Ground
Thomas Body PCB Electrical
Page 2-2
Hands-on Activity# 5
Battery, Ignition and Ground
Trace the battery cable for the body Where is the body breaker for B1HDX_________________________EF__________________________Conventional_________________Minotour______________________
Thomas Body PCB Electrical
Page 2-3
Battery, Ignition and Ground
Minotour
GMC
Ford
Thomas Body PCB Electrical
Page 2-4
Battery, Ground and Ignition
HDX
Battery cable to body from chassis
Thomas Body PCB Electrical
Page 2-5
Battery, Ignition and Ground
Cable routes from solid state breaker on left Frame rail under driver’s seat to B1
Saf-T-Liner-EF
Thomas Body PCB Electrical
Page 2-6
Battery, Ignition and Ground
61202164 solid state breaker
Used on HDX and EF as breakerfor battery to body and chassis
HDX- mounted on right frame rail just forward of engine compartmentEF-mounted to left frame rail below driver’s seat
Thomas Body PCB Electrical
Page 2-7
Battery, Ignition and Ground
Body Breaker on Conventional
• located in lower switch cabinet
Thomas Body PCB Electrical
Page 2-8
Battery, Ground, and Ignition
Follow the Ground cable from B1
Where does it go?
HDX________________________
EF__________________________
CONVENTIONAL______________
MINOTOUR___________________
Using drawing#52004770 and 52005370
Why is there no main ground cable on B2?______________________________
Locate drawing#52004993This is a jumper harness from B1 to B2Follow GND on Pin 1 to ground buss Inside B! and B2
Thomas Body PCB Electrical
Page 2-9
Battery, Ignition and Ground
See note B on drawing 52004778 and 52005555
Maximum tightening torque on power connections65 in-lbs
Thomas Body PCB Electrical
Page 2-10
Battery, Ground and Ignition
Shunts
Refer to drawing 52004770Locate J1 Shunts are non-keyed jumpers Easily changes safety buzzer behavior
Thomas Body PCB Electrical
Page 2-11
Battery, Ground, and Ignition
Use drawings 52004770, 52005370 and 52004993
Locate relay#5 on B1
Pin 87 of relay#5 power the ignition buss bar in B1
Follow the ignition/key switch signal from pin 86 of Relay#5
The chassis delivers the key switch signal atP_____ pin______
What powers the ignition buss bar in B2?_________________________________
Locate relay#10 on B2
What circuit connects at pin 86 of relay#10?____
-
Thomas Body PCB Electrical
Page 2-12
Battery, Ignition and Ground
Switched Power
See Drawings 52004770 & 52005370
The school bus market requests an unusual option;at rail road crossings we want to turn off allnoise so the driver can hear an on-coming train
Noise suppression requires control of specific consumerswhen the ignition is on
Locate the Noise Suppression relay#9 on B1 schematic
Like other relays power to pin 30 comes from battery Pin 87 output goes to switched power buss bar
Locate the relays controlling defroster fansWhat powers pin 30?_________________
From P28-B1 pin 4 delivers switched power to B2B2 noise suppression controls the radio
Thomas Body PCB Electrical
Section 3
Wiring
Thomas Body PCB Electrical
Page 3-2
• Wire is color coded• Ground wires are white• Wire printed with circuit number
Wiring
Thomas Body PCB Electrical
Page 3-3
LW-Warning Light JP-JumperLD-Light POW-Power from fuseSA-Safety RLY-RelayLB-Brake Light LGT-Output to lightLR-Rear Light IGN-IgnitionLT-Turn Light GA-GaugeFD-Fan PWR-PowerLS-Strobe Light ST-StartMH-Mirror SW-Switch DF-Door DIM-DimmerLM-Marker Light EL-HeadlightGND-Ground AL-AlternatorSP-Spare, Speaker AD-Air DryerIGN-Ignition ICU-DashBATT-Battery SG-Shielded GroundLP-Panel Light EL-HeadlightSW-Switch DRL-Daytime Running
* Abbreviation printed on wire and used on electrical drawings/schematics
Example: circuit# 10 is yellow and found in the body harnessWith prefix I know LT10 is the front & rear left turn lights
Wiring
Thomas Body PCB Electrical
Page 3-4
• Each PCB board has keyed connector locations on the back
• Each PCB board will have many of the same number of connector locations • These connector locations are referred to as “J” • the corresponding harness connector for each J location in the back is labeled “P” or plug
• these “J” and “P” numbers allow you to locate on the bus specific circuits shown in schematics
Wiring
Thomas Body PCB Electrical
Page 3-5
Wiring• Pre-made harnesses come color coded from the vendor• This color coding assists in production and service
Where do I installthese connections?
_______________
_______________
Thomas Body PCB Electrical
Page 3-6
Wiring
Switch Cabinets
• pre-assembled sub components during production• switch base harnesses route to the controlling PCB
Thomas Body PCB Electrical
Page 3-7
WiringChassis Interface Connector
Saf-T-Liner EF
Thomas Body PCB Electrical
Page 3-8
J10 interface connector located on left side rear cross-member
WiringChassis Interface Connector
Minotour / Ford and GMC
Thomas Body PCB Electrical
Page 3-9
Harness Routing
Transition path for harnesses from switch cabinet to body harness
HDX, EF and Conventional
Body harness
Front harness
Wiring
Thomas Body PCB Electrical
Page 3-10
Harness Routing
Minotour
Rear side ofOverhead Compartment
• Interface harness
• main body harness from PCBs
• switch cabinet harness
• battery cable to B1
Wiring
Thomas Body PCB Electrical
Page 3-11
Wiring
Body harness routing in left curtain rail for all models
What circuits would I find in this harness?___________________________________________
Where would I find connections to this harness?__________________________________________What types of electrical failures may I see in the bodyharness?_________________________________
Thomas Body PCB Electrical
Page 3-12
Wiring
Maintenance
Dos:• inspect wires • repair properly • protect
Don’ts:• damage when testing• make poor repairs• leave loose
Return to manufacture’s standard or improve it
Thomas Body PCB Electrical
Section
4
Understanding Thomas Drawings
Thomas Body PCB Electrical
Page 4-2
Understanding Thomas Drawings
Drawing Numbers beginning with 5 body
Drawing Numbers beginning with 6 chassis
Newest TBB Drawing numbers are 6 digit like 112034They are sequentially assigned
Thomas Body PCB Electrical
Page 4-3
Understanding Thomas Drawings
Types
Installation- a visual representation of either the component installation like harness routing or the installed component
Assembly- a visual representation of every piece used to make the assembly includes dimensions and part numbers
assembly drawing numbers are the part number for the assembly
Schematic- a visual representation of the flow of electricity through a specific path including all components
used primarily for diagnostic purposes
Thomas Body PCB Electrical
Page 4-4
Understanding Thomas Drawings
Assembly Drawings
Using drawing#52005500
How long is the wire from P34-B2 to the intersection at the left curtain rail?___________
What is the connector part number for P99?________
In P4-B1 what is the pin location for circuit LM12?____
What is circuit SP-2?__________________________
Installation Drawings
Using drawing#52006276
How many fasteners must be removed to R&R B2?___
Where is the Weldon flasher mounted?_____________
Are the PCBs mounted per this drawing?____________
Thomas Body PCB Electrical
Page 4-5
Understanding Thomas Drawings
Schematics
Use Drawing#52007002 to answer the following questions:
Do the dome lights work on battery or ignition?__________
How could I change the board to change the first question?________________
What PCB controls the dome lights?_________
What Amber LED lit tells me that Relay#4 has power?_____
Where would I look for S3 on circuit LD19 in the bus?_________________________________________
If diode D3 went bad inside B1 what would the driver report?___________________________________
What failure/s would result in front, rear and driver’s dome lights being inop?_______________________________
Thomas Body PCB Electrical
Page 4-6
Understanding Thomas Drawings
Using drawing#5204770
Please draw a straight-line type schematic for the front passenger heater
Thomas Body PCB Electrical
Page 4-7
Understanding Thomas Drawings
Use drawing#52006970 to answer the following questions:
How many PCBs control the warning light option?______
Which relay controls the red lights?_________________
When the driver opens the door what is the circuit number that tells the Weldon that the door is open?____________
LED#39 tells me power is being delivered to______________
What would happen if the GND circuit in jumper P28-B1 went open?_____________________________________
Where does the stop arm connect to B2?___________
What connects at connector#CSA ?_________________
What would happen if circuit JP3 was open?____________
Thomas Body PCB Electrical
Section 5
School Bus Options
Weldon 7000-100Pin Location & TBB Circuits
5 4 3 2 1 12 11 10 9 8 7 6
1 = Left Amber = LW55 yellow2 = Left Red = LW57 red3 = Stop Arm = LW82-2 gray4 = Right Red = LW56 red5 = Right Amber = LW58 yellow6 = Battery Power = LW149-1-A orange7 = Battery Power = LW149-1-B orange8 = Override Power 9 = Start Switch = LW80 tan10 =Seq. Door Switch(GND) = LW59 pink11 =Nonseq. Door Switch(GND) = LW81 purple12 =Ground = GND white
(Use 6 inch jumper with #16 Deutsch pins to troubleshoot)
Thomas Body PCB Electrical
Page 5-2
Thomas Body PCB Electrical
Page 5-3
Passenger Advisory-Check Mate
See PSB 07-11R4
Thomas Body PCB Electrical
Page 5-4
School Bus Options
Doran Light Monitor
• follow calibration sequence in PSB 07-13
Thomas Body PCB Electrical
Page 5-5
Aftermarket Add-ons
List consumers you may want to addTo the body after delivery
__________________________________________________________
How many amps are required?
Where is the consumer to be mounted?
When will it work? Key off or key on
Thomas Body PCB Electrical
Page 5-6
Aftermarket Add-ons
Using drawing 52004770
If I connect a consumer in series to the large terminals on B1either Battery or Ignition, what effect will it have on B1?___________________________________________
Thomas Body PCB Electrical
Page 5-7
Aftermarket Add-ons
Using drawing#52005555
Locate J32 on the drawing
This connection supplies the required datato correctly wire two relays(#2 and #8)
What is the maximum amp size of the addedconsumer?_______
What pin #s would be your output wires to your consumer?__________
What pin# goes to your switch?_______
Be Consistent and Keep RecordsWhat unit# and How is it wired
See Drawing 52006999 Fog Lamps
Thomas Body Electrical TBB2003
Page
Section 6
Service Resources-Printed-Electronic
Thomas Body PCB Electrical
Page 6-2
Service Publications
Printed Publications can be orderedBut more easily accessible on-line
Page 6-3
Mytbb.thomasbusonline.comHome page• Service training calendar• TBB news• support or sales• select tab for desired topic
Thomas Body PCB Electrical
Service Resources
Thomas Body PCB Electrical
Page 6-4
Electronic Service Resources
The “Parts” tab will provide • viewing/copying the bill of materials• parts look up • viewing of drawings
There are two “parts” tabsParts = Conventional, HDX, EF and MinotourC2 Parts = C2 only
Thomas Body PCB Electrical
Page 6-5
Electronic Service Resources
Information for the Body and Chassis BOM are group together in ModulesThe module number are a part of the number listedunder moduleUsing the module reference page will expedite locating the correction info
Thomas Body PCB Electrical
Page 6-6
Electronic Service Resources
Once the module has been selected The parts list for that module will appear at the right
The PDF files will be drawings you can open, then view save, print or email
Parts Tab
Thomas Body PCB Electrical
Page 6-7
Electronic Service Resources
Parts Tab-Drawings
The PDF drawing file is linked to specific Body Number
Mytbb.thomasbusonline.com
Manuals Tab- Product Support Bulletin
1. Click on desired Document Group 2. Topics are in sequence by release Topics are listed , not linked, on Home Page at TBB News
Page 6-8
Thomas Body PCB Electrical
Electronic Service Resources
Mytbb.thomasbusonline.com
Manuals Tab
1. Click on desired manual type at left
Page 6-9
Electronic Service Resources
Thomas Body PCB Electrical
Thomas Body PCB Electrical
Page 6-10
Electronic Service Resources
Manuals Tab-Electrical Manuals
These electrical manuals are PDF files of printedmanuals by year by modelYou will note that the newer the model the more pagesin the manual
Thomas Body PCB Electrical
Page 6-11
Electronic Service Resources
Manuals Tab-Product Support Bulletins
Product Support Bulletins • not available in any other way• organized by product (C2 separate)• organized by Body and Chassis then Category
Thomas Body PCB Electrical
Page 6-12
Electronic Service Resources
Manuals Tab-Product Support Bulletins
PSBs are in PDF files that you can view, print or email
Thomas Body PCB Electrical
Page 6-13
Electronic Service Resources
Manuals Tab-Electrical Manuals
PDF or Zip files organized by Body or Chassisthen by functional group like “Lights”* Best to know your order option number
Thomas Body PCB Electrical
Page 6-14
Electronic Service Resources
Manuals Tab-Reference
Within the Reference group you will find complete instructions on using this web site
Thomas Body PCB Electrical
Evaluation
7
Training Evaluation
Class:__________________________Date:___________Instructor: _____________________
1. Student manuals and handouts were?Excellent Good Poor 1 2 3 4 5 6 7 8 9 10
2. Overheads, presentations, and video tapes were?Excellent Good Poor 1 2 3 4 5 6 7 8 9 10
3. Shop demonstrations were?Excellent Good Poor 1 2 3 4 5 6 7 8 9 10
4. The length of the course was?Too Long Just Right Too Short 1 2 3 4 5 6 7 8 9 10
5. The pace of the presentation was?Too Fast Just Right Too Slow 1 2 3 4 5 6 7 8 9 10
6. The amount of shop time was?Too Much Just Right Not Enough 1 2 3 4 5 6 7 8 9 10
Please circle the number on each scale which most closely reflects your opinion
Training Evaluation page 2
7. Did the class provide the expected instruction? Yes Somewhat No 1 2 3 4 5 6 7 8 9 10Comments:_______________________________________________________________________
8. Would you recommend this class to others?Definitely To Some No 1 2 3 4 5 6 7 8 9 10
9. Do you feel that what you’ve learned will help you do your job better? Help A Lot Help Some No Help 1 2 3 4 5 6 7 8 9 10
10. What was your overall impression of the course?Excellent Good Poor 1 2 3 4 5 6 7 8 9 10
11. If you were to make changes, what would they be?_________________________________________________________________________________________________________________________________ Thanks for attending our class
Please circle the number on each scale which most closely reflects your opinion
Thomas Body PCB Electrical
Reference 8
-Modules-Identifying your bus-Circuit numbers
Thomas Body PCB Electrical
Page 8-2
Reference
Thomas Body PCB Electrical
Page 8-3
Reference
Locating Body
Identification Numbers
• Data plates are normally found above the driver’s window or on the front bulkhead
Thomas Body PCB Electrical
Reference
Page 8-4
NC VEH MFD BY:DATE:
GVWR:GAWR FRONT: WITH
TIRESRIMS
PSI COLDGAWR INTERMEDIATE: WITH TIRES
RIMSPSI COLD
GAWR REAR:WITH WITH TIRESRIMS
PSI COLDTHIS VEHICLE CONFORMS TO ALL APPLICABLE MAX CAPFEDERAL MOTOR VEHICLE SAFETY STANDARDS SUB TO DESIGNIN EFFECT IN: LIMITS:V.I.N.: CHAS. ID. NO: 27230VEH. TYPE: EQUIP. CAP.:BODY ID.: 82508 - 9952194 - 1308S
(order #) - (body #) - (model #)
HIGH POINT, NORTH CAROLINAWOODSTOCK, ONTARIOMONTERREY, M.L., MEXICO
MFD. BY THOMAS BUILT BUSES, INC.MADE IN U.S.A. DATE:
Body Identification Number
Reference
Thomas Body PCB Electrical
Page 8-5
Three Groups of Numbers
82508 - 9952194 - 1308S
Body Identification Number
Order# (first group) -Assigned consecutively to an order when it is received in High Point -Each Pusher has its own order#
Body# (second group) -Assigned consecutively to each body -First two digits are year built
Body Model ID (third group) -First three digits are body length -Fourth digit is type of bus -Fifth digit indicates school or non-school
Thomas Body PCB Electrical
Reference
Page 8-6
HIGH POINT, NORTH CAROLINAWOODSTOCK, ONTARIOMONTERREY, M.L., MEXICO
MFD. BY THOMAS BUILT BUSES, INC.MADE IN U.S.A. DATE:
CHASSIS MODEL YARD NO. YEAR
ENGINE: SER NO
TRANS: SER NO
FRONT MODAXLE NO
INT MODAXLE NO
REAR MODAXLE NO
BODY ID.:
Body Identification Number
Chassis Data Plate• Body Id# found here as well as standard data plate
Thomas Body PCB Electrical
Reference
Page 8-7
Locating Body Identification
Numbers By Model
Minotour, SRW & DRW
Order# & Body#
Thomas Body PCB Electrical
Reference
Page 8-8
Locating Body Identification
Numbers By Model
Conventional
Order# & Body#
Thomas Body PCB Electrical
Reference
Page 8-9
Locating Body Identification
Numbers By Model
Saf-T-Liner ER and HD
(butyl tape applied trim)
Order# & Model#
Reference
Thomas Body PCB Electrical
Page 8-10
Locating Body Identification
Numbers By Model
Saf-T-Liner ER , HD and HDX
(fastener applied trim on D/door post)
Order # & Body# on welded plate mounted on firewall below treadle valve
Thomas Body PCB Electrical
Reference
Page 8-11
ReferenceLocating ID Numbers
Chassis number stamped
Thomas Body PCB Electrical
Page 8-12
Page 8-13
1 T 7 Y R 4 B 2 8 4 1 1 3 2 5 4 0
Thomas Body PCB Electrical
Use this vin # to answer these questionsWhat model is ______________________________?What type of engine does it have _______________?What is the headroom________________________?What was the year of manufacture______________?Does this bus have air or hydraulic brakes________?
Reference
Identifying the Bus
MERCEDES
CUMMINS
Thomas Body Electrical
Reference
Page 8-14
Body Circuit Numbers
Circuit# Description Color
176 Doran Monitor Feed Red
177 Doran Monitor Ground White
AV599 LED Pilot Light Pink
Batt Battery Power Green
BRK_INTERLOCK Signal to Chassis disrupts brake Orange
CHILD_ALARM Signal to Chassis for Child Alarm Horn Purple/White
CROSS_ARM Signal to Chassis for Crossing Arm Purple/White
DF426 Door Switch Open Green
DF427 Door Switch Override Yellow
DF428 Door Signal Red
DOOR_RTN Signal to Chassis for Door DK Blue
DS27 Destination Sign Pink
F_L Front Passenger Heater Low Purple
F_P_H Front Passenger Heater High Yellow
F317 Hatch Fan Orange
FD34 Left Defroster Fan Gray
FD35 Right Defroster Fan Tan
FD36 Left Defroster Fan Black
FD37 Right Defroster Fan Blue
GND Ground White
Horn Horn Output Blue
Thomas Body Electrical Reference
Page 8-15
HTR_CBLE_F Front Heater Red
HTR_CBLE_R Rear Heater Red
IGN Ignition Power Red
IGN_F_P Ignition Front Passenger Heater Blue
IGN_R_P Ignition Right Passenger Heater Blue
KNEEL_CKT Signal to Chassis for kneel Black
LB13 Brake Light Blue
LB15 Right Brake Light Red
LB16 Left Brake Light Red/White
LB172 Brake Light Indicator Red
LD19 Rear Dome Lights Black
LD20 Front Dome Lights White/Black
LD20 Driver's Dome Light Black
LE74 Front Entrance Light Blue
LM12 Marker Light Brown/White
LM168 Marker Light Brown
LM40 Side Marker Lights Brown
Low_SPD_SIG Signal from Chassis for low speed Tan
LP70 Panel Lamp Orange
LP70-A Dimmer Black
LR14 Reverse Light Blue/White
LR170 Reverse Light Blue
LR170A Reverse Light Feed Brown
LS38 Strobe Light Purple
Body Circuit Numbers
Circuit# Description Color
Thomas Body Electrical Reference
Page 8-16
LT10 Front & Rear Left Turn Lamp Yellow
LT174 Left Turn Lamp Yellow
LT175 Right Turn Lamp Green
LT9 Front & Rear Right Turn Lamp D Green
LW1 Left Rear Red Warning Light Black
LW149 Warning Light Flasher Power Orange
LW2 Right Front Red Warning Light Brown
LW3 Right Rear Red Warning Light Orange
LW4 Left Front Red Warning Light Yellow
LW5 Left Rear Amber Warning Light Blue
LW55 Amber Warning Light Yellow
LW56 Red Warning Light Red
LW57 Red Warning Light Red
LW58 Amber Warning Light Yellow
LW59 Door Switch Signal (ground) Pink
LW6 Right Front Amber Warning Light White
LW7 Right Rear Amber Warning Light Red
LW8 Left Front Amber Warning Light Green
LW80 Start Switch 12V+ Tan
LW81 Door Open Purple
LW82 Stop Arm Signal Gray
MH468 Left Heated Mirror Orange
MH469 Right Heated Mirror Blue
Body Circuit Numbers
Thomas Body PCB Electrical Reference
Page R-4
Neutral Signal from Chassis for neutral Black
Pump Coolant Pump Brown
R_L Rear Passenger Heater Low Pink
R_P_H Rear Passenger Heater High Yellow
SA29 Buzzer (GND) Blue
SA32 Vandalock Ground Signal to Chassis Yellow
SA32-A Vandalock Ground Signal from Rear Gray
SA32-B Vandalock Yellow
SA33 Buzzer Power Pink
SD59 Door SW Open to Flasher Pink
SP1 Spare Wire for Front Door Purple
SP2 Spare Wire to Rear Green
SP3 Spare Wire for Child Alarm Black
SP4 Spare Wire for Dome Light Yellow
SW+ Rear Door Switch Purple
SW1+ Switched Ign Power to Switch Gray
SW2+ Switched Ign Power to Switch Gray
Body Circuit Numbers
Circuit# Description Color