Originally Posted by TheRepoMan

The 75amp fuse is for the alternator, which is why nothing side the car works. The car should still run without that fuse you just wont have any lights or power within the car. Since the battery was in the trunk and there was no harness then my next guess would be the grounds. Check and make sure your battery grounds are good and the rest of the harness grounds are good. I just had the same problem with my car. Cleaned up the battery ground, engine and chassis grounds and started right up.

Hope that helped brah