Will 87 Iroc harness work in 89 GTA
I purchased a 89 Gta with no engine no trans. I recently bought a 87 Iroc. THen took the engine and trans with harness and computer out of the iroc. everything thing is in but the iroc harness has an additional plug with 2 pnk/blk 1 tan/white besides the 15 pin plug .

Any help????

 

i have no specific knowledge on this but, if it were me i would get the wiring diagrams for both cars to be sure what i already connected is correct and to figure out what i have left over.