Hot wire from alternator to inside wire connecting to wire going to fuse box archs white color and gets hot wanting to melt . when i connect wire ligths on truck get very brigth but wire wants to get to hot.this is a 1985 ford ranger 4wd v6 2.8 liter. no fuse blow everything runs great but cant leave alternator hooked to charge battery. could it be voltage regulator?

Cars & Trucks - Ford - Ranger - 1985 Ford Ranger