I have an 83 f150 with a 460 out of a f250 and it has a f150 harness I put a new alt battery volt regulator and selenoid and wires for all that but for some reason the charging changes all the time from none to 16.5 volts and I can't figure out why if you have access to a 83 f150 wiring diagram or can help with any ideas at all please help any help very much appreciated I've been working on it for too long