Hello. I just got my dream car last month. I got a 1988 Toyota Supra, Turbo model with automatic transmission. It has the stock 7mgte motor. It only has 132,000 miles and is one hundred percent oem. I traded my lifted 89 toyota 4x4 pick up for her. I am having the same problem with the supra I had with my truck, faulty wiring harness. The engine wiring harness is fried an causing multiple sensors to not be read correctly by the ECU. I need a new oem harness and I have no idea where to find one. I've looked for days online an can find a jdm motor with 60k on it an the wiring harness attached for $3000, but that all. I found a company called tweaked performance that said for $1500 I could send him mine an he would rebuild it. I am a disabled Iraqi combat veteran from the 82nd airborne div and am on a limited income so I'm hoping to find one cheaper an newer. Are you aware of any jdm shops I can order one from? Thank you for your time and attention.
Thank you for helping me. These are same issue I was running into during my search they are sold out. I figured it would be difficult state side to find one as the car is not as common but I was hoping maybe there may be a japanese company selling refurbished or new old stock stuff. I'm truly falling in love with this supra though. I've been driving an acura integra for 5 years an love it as well an acura has a lot of aftermarket support I've found but I've been extremely limited on mk3 supra support. Best I've found Is a company called drift motion.com in california that has 90 percent of what I will need but they don't have harnesses either
You will have to try contacting this company directly to check if they can assist you. Is this your exact vehicle model?
https://www.nengun.com/toyota/supra-a70-mkiii-ma70/electronics
Have you searched on eBay?
