So the alternator I had went out and so I desided to replace it with a 3 wire chevy alternator. I have it all wired (although the amp is backward lol) and it reads about 10 amps running. I looked through some wiring diagrams and see that some have a resister on the excitor wire and others dont. I heard that if it doesn't have it then it will charge at 100%, and I was getting a charge at like 16, little high lol, so I shut it off and started it again and it read like 14ish. My batter is bad, so could a shorted out battery be causing this? And shoudl I put a shunt into the system or just get a battery first? And if so what rating of a resister do I need? Thanks!