Hey everyone,

I'm helping a friend who just bought an 84 that he bought as an unfinished project car. The motor is an 86 Vette L98 and the wiring harness is 88 IROC. He bought the car not running. What we discovered was that the ECM was not getting power.

From poring over the 88 F wiring diagrams, it seems that the orange wires are supposed to be always hot. However, they are not. It is not clear to me where they are supposed to hook to a red wire. He only has a Chilton's manual for the '88. If we splice an orange wire under the hood to a wire that's always hot, then the ECM gets power and the car will start and idle. However we would like to fix it right. If anyone can share some knowledge or send me a relevant 88 wiring schematic, that would be great.

 

I guess this wouldn't have anything to do with VATS? I see a Passkey in the 88 wiring diagram.... On my car the vats disables the fuel pump. I would imagine the pcm still gets power from the orange, hot all the time, wires.