My 60 pickup has an alternator (internal regulator)instead of the original generator. It has always run fine until recently. After driving with lights on the truck started to cut out before I got home. I reached home and shut it off. Would not start after that. Replaced battery, had alternator bench tested and all tests show alt. is charging. I unhook neg. battery cable and truck dies. Doesn't that indicate the alt. isn't charging? Do I have short in wire going back to battery and what wire is that? I would appreciate any help. I have a wiring diagram but I don't understand how to read it.
