I'm trying to help my brother with his 85 Toyota pickup. Sadly, I didn't help take everything apart, but he had to swap motors and now that everything is getting back together he is blowing his 80A main fuse every time he hooks up his battery. I think he said he also blew the fuse (maybe relay) to the ignition switch as well.
Any thoughts? I've done a bunch of electrical troubleshooting in the past, but for some reason I am drawing a blank on this. What could I do with an DVOM to help pinpoint where it is shorting?