So on my 85 we found that the batteries fusible link was bad. So we rigged a new one up and viola! Everything worked. Well maybe a little to much. The radio doesn't work at all, the A/C was on full blast but i couldn't turn it down and some dash lights worked built the rest of the dash didn't. Its the digital dash. Headlights would come up but not go back down until i unhooked and rehooked the negative cable and the lights are stuck on because someone broke my multi-function switch.

What might be the cause of this? I was mainly confused how to A/C worked but I can't control it.

Thanks!