I am about to go crazy if I do not find out how to properly wire the charging system for my 1975 chevy blazer. I have a 3 wire alternator that I just purchased pushing about 80 amps. The guy I just bought it from dropped a brand new motor in and I think he did not wire the battery, starter and alternator back correctly b/c he says its not charging up the battery. I took all the wire out of the engine bay b/c they were rotten and shorting out in places. I figured that was the problem. I just dont understand why from the alternator the batt connection runs up to this junction block onto the firewall and then down to the starter. The main Positive battery cable runs from the batt to the starter. I just dont see the point in these junction studs on the firewall. If anyone knows where I can find info on this wiring I would love you forever. I just want to do it right b/c we all know that the charging system is by far the most important part of our trucks. I have googled High and Low for this info and even bought a Chilton manual. Nothing!