My son, who was 13 when he got a 1989 GT from grandpaw, now 15, and I have put a stereo system together, built and installed on our own. We are running into a wiring problem. We did the 3g 150amp conversion, and also the " big 3 " wiring for the system. Stock, there was a power wire from the + on the battery, to the starter solenoid. Now I am confused, I have a 4 gauge wire going from the bat. to the solenoid, a power wire going to the system in the back from the bat. and the 4gauge wire from the alternator. Where do I put the wire from the alt? I have seen to the solenoid, or the bat? Please help.