I need help diagnosing what’s wrong with my 1990 civic so with a b20b4 swap. The car died while driving and was showing signs of super low voltage. When I go to start it, it makes a weird sound and doesn’t start. Not the usual “just needs a jump” sound.

Video of the sound: https://youtube.com/shorts/N7B0MCs_fxU?feature=share

 

Upload the video to YouTube then give us the link to it

 

I figured it out. The car died cause the ground on the alternator broke off and the starter is dead.

 

The alternator grounds through the mounting bolts. If you're talking about the large gauge wire, that's +12V. Just want to make sure you don't go sending that to ground by accident.

 

the ground I’m talking about is on the top of the alternator. The people that did the swap put a 89 integra alternator with the b20b4 swap. I dont know if they are different but the ground on this one is on the top of it.

 

That is not a ground. That is +12V.