Ok I just bought a 85 Monte Carlo ss. I soon relized after purchase that it wasn't the original motor fine. It's a 350 in it. Everything runs and starts up. Problem is lights no electrical is working nothing. A few things I noticed that work are when I push in the stop brakes they light on the dash turns on. That's it. I attached what wiring looks underneath. My guess is idk. I am a decent mechanic but idk. Any help with be appreciated. I believe they didn't attach the other electrical harness from the last engine to the new motor. But idk. Any help would be awesome. Ps. It does start and run . The only thing connected to the battery is the alternator , and starter.