I need to know which body wiring harness goes to my truck- VIN lookup

ANSWER : My best recommendation would be to contact your local dealership. If you give them your year, make, model, vin, and a description of the wiring harness that you need, they should be able to give you some information in regards to the part number. Unfortunately, the dealership is about the only possible chance of tracking down this harness other than getting one from a junk yard.

ANSWER : 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.

ANSWER : Hi there. When it comes to swapping engines for your vehicle, what you can do is check all of the engine mounts and transmission mounts and make sure that they will work. If the mounts are a little off but there is room, then you may have to retro fit a custom mount. Check the length of the engine and the transmission assembly together. Make sure that the assembly is the same length. It may be okay if it’s a few inches shorter or longer, however, it cannot exceed 3 inches or the assembly will not fit. There has to be room for the engine to move around. Also, keep in mind, the CV shafts may not match up to the transmission and wheel hubs, especially if the transmission is shorter or longer. If you need further assistance with swapping your engine with another engine, then seek out a professional, such as one from Your Mechanic, to help you.

ANSWER : Hi there. The automotive manufacturer is 100% correct in their estimation about splicing a wiring harness. Today’s vehicles are 100% controlled and monitored by electrical and computer operated systems. These systems require a clear and unaltered wiring system that sends electrical signals from sensors and components to the ECU and back. Splicing or altering the wiring in any way is very unsafe and can disable several safety systems including air bags, anti-lock brakes and other systems.

ANSWER : Hi there. In theory, as long as you connect the two harnesses together correctly, that should work. It might be better to run straight wires from the accessory switch to the component you’re powering or consult with the aftermarket light manufacturer to see if they have a solution for you.

ANSWER : It would be difficult to say if the shorted area of the harness was damaged in the accident. If it is in the area of the impact, it may be possible. If the bad part of the harness is located anywhere other than the impact area, then probably not. As for replacing the entire harness rather than repairing it, some manufacturers require replacing the entire wiring harness if there is ANY damage to the air bag wiring, even in the smallest, for safety and legal reasons. Some allow repairs within certain guidelines which also vary from make to make. As to why it will take so long to get the harness, it is not a commonly replaced part. They generally do not have replacement wiring harnesses on the shelf ready to send out. Typically, they have to be made specifically for your vehicle which can take some time. In some instances, they are made by hand.
If it was damaged in the accident, then the insurance company should be paying for the replacement. If the damage/defective area is not located anywhere near the impact area and the harness is intact, then you may have a case for it being replaced under warranty.

ANSWER : It is very likely that you have a powertrain control module failure. This can happen often on many GM vehicles. I would recommend having the powertrain control module tested and replaced as necessary in order to resolve this issue. After the powertrain control module is replaced, a reflash procedure will be required so that the vehicle can relearn all of its primary engine data. Once the reflash is completed, your vehicle should no longer have this issue.

ANSWER : Hi there. I’m assuming the connector on the wire harness is broken and now one of the wires has broken. One of the things you could do is locate another matching truck in a junkyard or being parted out and retrieve the window switch harness pigtail. Cut the harness well below the connector so that you have plenty of wire to work with. You could then attach the newer pig tail, matching the wires, and connect it to the window switch. Wire cutters, solder, soldering iron, heat shrink tubing, and some black electrical tap should do the trick; use the tape to wrap the newly connected pigtail at the new connection. If the switch is broken at the connector, simply replace the switch with a new or known working used one. Performing a proper electrical connection can be a daunting task; I suggest having a qualified technician perform an inspection to determine what all needs to be corrected to avoid replacing unnecessary parts and complete the electrical connection properly for trouble free repair. Your Mechanic has several available technicians that can assist you with an electrical problems inspection.