Skip the auto shop - Our mechanics make house calls

Q: How can I find the correct chassis wiring harness for my truck?

asked by on

Hi,

My 98 K2500 pickup has some wiring issues. I actually described it in another question back in October, but that's when I was going to replace individual burnt wires. Now I just want to replace the whole chassis wiring harness. There are so many different part numbers and diagrams, I'm very confused. I need the wire cluster that goes along the inside of the frame rail, next to the gas tank, and goes to the fuel pump and the tail lights. The front connects to a few different spots under the hood and also into the dash, I believe. Can you give me a specific name or part number for this wire cluster? Thank you.

My car has 175000 miles.
My car has an automatic transmission.

The harnesses are referred to in GM parts catalogs as "body wiring" and "rear lamp wiring". However, the correct wiring harness for your vehicle can only be found via a VIN number search in the catalog. It can’t be searched simply by "model" due to the large number of vehicle variants, for example RPO codes. There is no way to look up a harness part number without your VIN number so please send it. Unfortunately, many of the wiring harnesses, including many within the two "categories" you are inquiring about are discontinued by GM. Inasmuch as some are available it is still worth looking up and confirming whether you can get it or not, but you may be in a situation where you have to fabricate your own replacement harness which is not a big deal particularly if you have the old one available to use as a template. The biggest issue are the cable terminations but many of those may be standard and thus pigtails will be available. You could actually make a better (higher quality) harness than that originally used on the vehicle. Please let us know how we can assist you further.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: rear turn signal is out brake light works just not the turn signal?

If the front turn signals work but the rear does not, then it is not the fuse of the turn signal switch. You do have a trailer adapter module in left side of luggage compartment that may not be sending...

Q: Blower resistor stays on - 1998 Volvo S90

Hello. It sounds like you may have a series of issues going on with the car. The blower motor staying on all of the time tells me that there amy be a relay that is sticking. It can be the...

Q: Rattling sound/bells from under the vehicle heard 2016 ram1500 5.7L 15000 miles only heard between 20-40mph 2000rpm accelerating

Hi there. Typically when you have a rattling noise as you've described, it's caused by a loose bracket or other component that might have been removed to complete the oil change for some reason. I wouldn't suspect that the rattle...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.