Which wires give constant, ignition and ground on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
On a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD, take constant power from the Red/Yellow wire at the junction block X61A under the steering wheel, connector X7, pins 7 and 17, circuit 2340, ignition from the Violet/White wire at the junction block X61A under the steering wheel, connector X7, pin 11, circuit 1939, and ground to the Black wire at the junction block X61A under the steering wheel, connector X7, pin 10, circuit 1050. Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Location not confirmedBest power spot:OBD port wires or the dash power outletsSystem voltage:12VIgnition type:Not confirmed
Where do I get constant, ignition and ground on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
GM prints battery, run, accessory and ground wires at the junction block under the steering wheel, connector X7, the auxiliary fuse block harness built for upfitters.
Option 1 All four wires
Junction block X61A, connector X7
Under the steering wheel, the auxiliary fuse block harness.
Constant
Red/Yellow
Junction block X61A under the steering wheel, connector X7, pins 7 and 17, circuit 2340Battery positive voltage.
Ignition
Violet/White
Junction block X61A under the steering wheel, connector X7, pin 11, circuit 1939Run/crank ignition 1 voltage.
Ground
Black
Junction block X61A under the steering wheel, connector X7, pin 10, circuit 1050Ground.
Accessory
Violet/Yellow
Junction block X61A under the steering wheel, connector X7, pin 8, circuit 43Accessory voltage.
Pin 19 (Green/Gray) is vehicle speed. Pins 20, 14, 4 and 1 are the upfitter switch provisions on trucks with option 9L7.
Option 2 Tracker only
At the OBD port
The wires on the back of the 16-pin diagnostic connector.
Constant
Red/Dark Blue
OBD port (data link connector X84), pin 16, circuit 3240Fused battery feed. Thin wire, so use it for a tracker only.
Ignition
Not on this plug
Use the junction block (Option 1)The OBD port has no ignition pin.
Ground
Black
OBD port (data link connector X84), pin 4, circuit 1050Ground. Pin 5 is a signal ground, Black/White.
Power outlets (option D07) also carry battery (Red/White, Red/Brown) and accessory (Violet/Yellow) feeds on pin A.
All colors from GM's 2023 electrical body builder manual, which GM lists for 2023 to 2026.
Where are the turn signal, reverse and light wires on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow/Blue
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin GLeft stop and turn output for a trailer.
Right turnPositive +Not yet checked
Green/Brown
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin DRight stop and turn output for a trailer.
Park lightPositive +Not yet checked
Gray/Brown
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin FPark lamp output for a trailer.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReversePositive +Not yet checked
White/Green
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin ABackup lamp output for a trailer.
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: GM's 2023 electrical body builder manual, which GM lists for 2023 to 2026 (trailer connector X88).
Where are the brake, door, speed and CAN wires on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Yellow/Blue (left)
Green/Brown (right)
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pins G and DStop is combined with the turn signal on these two wires. No separate brake wire was found.
Vehicle speedAC signalNot yet checked
Green/Gray
Junction block X61A under the steering wheel, connector X7, pin 19, circuit 817Vehicle speed signal. GM bulletin 182 gives 4,000 pulses per mile.
Upfitter switch outputsPositive +Not yet checked
Blue (1)
Gray/Black (2)
Yellow/Brown (3)
Red/Green (4)
Junction block X61A under the steering wheel, connector X7, pins 20, 14, 4 and 1 (option 9L7)Configurable provisions 1 to 4 for dash upfitter switches.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not foundGM bulletin 184 gives a park status signal at the body control module, but only after a lead is added and the module is reprogrammed.
Trailer battery feedPositive +Not yet checked
Red/Violet
Trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin EBattery voltage at all times. Pin B is a Black ground.
CAN busDataNot yet checked
Dark Blue (+)
White (-)
OBD port (data link connector X84), pins 6 and 14High speed GMLAN bus 1. A second high speed bus is on pins 12 and 13, low speed GMLAN on pin 1. Never cut or splice these wires.
Sources: GM's Silverado 4500HD to 6500HD electrical body builder manuals (2019, 2021, 2023), GM upfitter bulletins 148e, 182 and 184, and GM TechLink. Doors, hazard, headlight and dome wires, the ignition type and the exact OBD port position were not found.
Where are the fuse boxes and ground points on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
InteriorTwo instrument panel fuse blocks, left and rightGM names them X51L and X51R. The junction block with the upfitter pins is under the steering wheel.
Under the hood and cabUnderhood fuse block. Battery box under the cab, driver sideGM describes a covered jump start positive stud beneath the driver door on the 2019 truck.
Ground pointsBlack ground wires at each connectorNo named ground stud was found. Use clean, bare body metal if you add a ground.
No fuse list could be read for this truck, so no fuse tap position is given. GM moves a 5 amp fuse between two slots to switch the upfitter switches from battery to run power, and says never to fill both slots of a pair.
Where is the OBD-II port on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
OBD II
Diagnostic portOBD-II port: location not confirmedLook under the driver side dash first, and send us a photo if you find it.
Which years share wiring with the 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
This page2023Silverado 4500HD, 5500HD and 6500HD.
Same wiring2019, 2020, 2021, 2022, 2024, 2025, 2026GM's 2019, 2021 and 2023 manuals print the same OBD port, power outlet and trailer colors. The 2023 to 2026 pages add the junction block colors.
Not this pageOther years, the International CV and the Silverado 2500HD and 3500HDThe International CV is built on the same line and uses the same connector names, but its wire colors are not confirmed. The 2500HD and 3500HD are different trucks.
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This page covers the 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD medium duty chassis cabs.
Every color here comes from GM's 2023 electrical body builder manual, which GM lists for 2023 to 2026. GM prints the run, accessory, battery and ground wires at the junction block under the steering wheel for these years. Our own team has not yet metered these on a 2023 truck.
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.
Common questions about 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD wiring
What wire is constant power on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
Red/Yellow at the junction block X61A under the steering wheel, connector X7, pins 7 and 17, circuit 2340. Battery positive voltage. Meter it before you tap it.
What wire is ignition on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
Violet/White at the junction block X61A under the steering wheel, connector X7, pin 11, circuit 1939. Run/crank ignition 1 voltage. Meter it before you tap it.
Where is the reverse wire on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
White/Green (positive +) at the trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pin A. Backup lamp output for a trailer. Meter it before you tap it.
Where is the brake wire on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
Yellow/Blue (left) and Green/Brown (right) (positive +) at the trailer connector X88, rear left of the chassis (trucks with trailer option UY7), pins G and D. Stop is combined with the turn signal on these two wires. Meter it before you tap it.
Where is the vehicle speed signal on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
Green/Gray at the junction block X61A under the steering wheel, connector X7, pin 19, circuit 817. Vehicle speed signal. Meter it before you tap it.
Where is the CAN bus on a 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
Dark Blue (+) and White (-) at the OBD port (data link connector X84), pins 6 and 14. High speed GMLAN bus 1.
Which years share wiring with the 2023 Chevrolet Silverado 4500HD, 5500HD and 6500HD?
2019, 2020, 2021, 2022, 2024, 2025, 2026. GM's 2019, 2021 and 2023 manuals print the same OBD port, power outlet and trailer colors.
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