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Which wires give constant, ignition and ground on a 2012 Kenworth T170, T270 and T370?
On a 2012 Kenworth T170, T270 and T370, take constant power from the Red wire at the spare circuit connector in the dash harness, behind the dash panel, labeled RED1211-0, ignition from the Orange wire at the spare circuit connector in the dash harness, behind the dash panel, labeled ORN1221-0, and ground to the White wire at the optional body harness, wire tagged GND. Meter every wire first.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the truck in front of you.
This page covers the 2012 Kenworth T170, T270 and T370 with the multiplexed dash.
Kenworth gives installers labeled spare circuits behind the dash panel: three battery wires and two ignition wires, each with its own fuse position. Those are the power wires on this page. Lamp wires are in the optional body harness, where every wire end carries a tag. Our own team has not yet metered these on a 2012 truck.
Diagnostic portLocation not confirmed
Best power spotSpare circuits behind the dash panel
System voltage12V
Ignition typeKey
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Where do I get constant, ignition and ground on a 2012 Kenworth T170, T270 and T370?
Kenworth provides labeled spare circuits behind the dash for exactly this. Use them before you tap anything else.
Option 1 Constant and ignition
Spare circuits behind the dash
Labeled connectors in the dash harness. Three battery circuits and two ignition circuits.
Constant
Red
Spare circuit connector in the dash harness, behind the dash panel, labeled RED1211-0Spare battery circuit 1, 15 amps, fuse position F49. RED1212-0 is spare battery 2 (15 amps, F50) and RED1213-0 is spare battery 3 (20 amps, F29).
Ignition
Orange
Spare circuit connector in the dash harness, behind the dash panel, labeled ORN1221-0Spare ignition circuit 1, 15 amps, fuse position F81. ORN1222-0 is spare ignition 2 (15 amps, F80).
Ground
White
Optional body harness, wire tagged GNDGround wire of the body harness. Kenworth says power and return lines for added equipment go to the battery, and the frame must not be used as a ground.
From Kenworth. Each spare circuit is dead until you put a fuse in its numbered position in the fuse panel behind the dash. A truck can have up to five of these, depending on how it was ordered, and the factory may already be using some of them.
Option 2 Aux power and ground
Body harness
Optional harness for body equipment, with tagged wire ends.
Aux power
Blue
Optional body harness, wire tagged AUX PWROne 15 amp circuit. With a fuse in position F79 it is live only with the ignition on. With a fuse in position F36 it is live all the time. Kenworth says not to use it for anything else if it feeds a trailer.
Ground
White
Optional body harness, wire tagged GNDGround wire of the body harness.
From Kenworth. The body harness plugs in on the left frame rail, directly behind the battery box. It ships coiled up loose in the cab, with a tag on each wire end.
All wires from Kenworth's T170, T270 and T370 body builders manual (December 2011), which covers trucks with 2010 emissions engines. Kenworth says a 2010 chassis can be picked out by its diesel exhaust fluid gauge.
What are the turn signal, reverse and light wires on a 2012 Kenworth T170, T270 and T370?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow/Black
Optional body harness, wire tagged LH TURNLeft turn signal for body lamps. Flashes with the cab turn signal.
Right turnPositive +Not yet checked
Green/Black
Optional body harness, wire tagged RH TURNRight turn signal for body lamps.
Park lightPositive +Not yet checked
Brown (tail)
Black (clearance)
Optional body harness, wires tagged TAIL LP and CLEARANCE LPTail lamp and clearance lamp feeds. Note that the clearance lamp wire is black, so do not mistake it for a ground.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReversePositive +Not yet checked
Pink/White
Optional body harness, wire tagged BACKUP LPBackup lamp. Kenworth says this circuit is powered with the key on.
Dome lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Each chip shows the main insulation color with its stripe. Source: Kenworth's T170, T270 and T370 body builders manual (December 2011) (optional body harness).
Where are the brake, door, speed and CAN wires on a 2012 Kenworth T170, T270 and T370?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Red
Optional body harness, wire tagged STOP LPBrake lamp feed for body lamps. Do not confuse it with the red spare battery wires behind the dash.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
HazardNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
J1939 dataNot foundNot yet checked
Not found
Not foundNo data link wire color or diagnostic port pin was found. A later Kenworth manual says the wiring to the engine, emissions parts and data links may not be spliced.
Source: Kenworth's T170, T270 and T370 body builders manual (December 2011). Doors, parking brake, hazard, speed and data link wires and the diagnostic port type were not found for these years. Kenworth's manual for 2017 and newer trucks puts the diagnostic port below the dash, left of the steering wheel.
Which years share wiring with the 2012 Kenworth T170, T270 and T370?
This page2012T170, T270 and T370.
Same wiring2010 and 2011Kenworth's manual dated December 2011 covers trucks with 2010 emissions engines, the first with the multiplexed dash.
Not this page2009 and older, 2013 and newer, and the T440 and T470Older trucks are not multiplexed and Kenworth sends you to the dealer for them. The manual for 2017 and newer lists the same sections, but we could not read its pages. The T440 and T470 are a different cab.
Where are the fuse boxes and ground points on a 2012 Kenworth T170, T270 and T370?
InteriorFuse panel behind the dash panelThe spare circuits use numbered positions F29, F49, F50, F80 and F81. The body harness aux power uses F79 for ignition or F36 for battery.
OutsideBody harness connector on the left frame rail, directly behind the battery boxNo under hood fuse box information was found.
Ground pointsBattery negativeKenworth says return lines for added equipment go to the battery, not the frame. The body harness has a White ground wire tagged GND.
From the Kenworth body builders manual. No fuse panel drawing could be read, so no other fuse position is given.
Where is the diagnostic port on a 2012 Kenworth T170, T270 and T370?
DIAG
Diagnostic portDiagnostic port: location not confirmedLook under the driver side dash first, and send us a photo if you find it.
Common questions about 2012 Kenworth T170, T270 and T370 wiring
What wire is constant power on a 2012 Kenworth T170, T270 and T370?
Red at the spare circuit connector in the dash harness, behind the dash panel, labeled RED1211-0. Spare battery circuit 1, 15 amps, fuse position F49. Meter it before you tap it.
What wire is ignition on a 2012 Kenworth T170, T270 and T370?
Orange at the spare circuit connector in the dash harness, behind the dash panel, labeled ORN1221-0. Spare ignition circuit 1, 15 amps, fuse position F81. Meter it before you tap it.
Where is the reverse wire on a 2012 Kenworth T170, T270 and T370?
Pink/White (positive +) at the optional body harness, wire tagged BACKUP LP. Backup lamp. Meter it before you tap it.
Where is the brake wire on a 2012 Kenworth T170, T270 and T370?
Red (positive +) at the optional body harness, wire tagged STOP LP. Brake lamp feed for body lamps. Meter it before you tap it.
Which years share wiring with the 2012 Kenworth T170, T270 and T370?
2010 and 2011. Kenworth's manual dated December 2011 covers trucks with 2010 emissions engines, the first with the multiplexed dash.
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