Battery draining fast

Okay, So, maybe all you need to do is clean up that ring terminal on the smaller red wire at the starter. Or, a new red #8 gauge wire between the positive battery terminal an the 5/16" battery stud on the starter relay would be the way the factory wired it.You also might want to get under the dash and make sure the ammeter terminals are clean and tight. Also, check out the battery cables. The negative cable should run to the closest intake manifold bolt. It's not a bad idea to use a negative cable with a separate smaller wire that you could ground to the body close to the battery

You didn't mention what lead you to look into this wiring again, I'm assuming it was not charging again. Check both battery cables an make sure they are clean and tight on the battery terminals and that there is no corrosion from battery acid that has gotten into the cables.