I changed the alternator think it was bad, so thats not the problem anymore. Bought a new battery for it, it started up fine no problems at all, next morning the new battery is dead.
What can it be? i did find a ground wire coming from my main harness not hooked up

 

that definately could be the prob, just go through and check for any disconnected wires, or a blown fuse. Also check to see if you accidentally hooked up something wrong

 

Check all the wires, grounds and etc

 

On the s13 harness there are some plugs that will not be use right?

 

I believe so

 

On the tranny harness is there a ground wire on it?

 

Im 99% sure there is