That junction block on the firewall isn't stock. That's where the voltage regulator should be. Has it been converted to alternator? It should be 6 volts but who knows if it's been changed to 12v.
The truck has been converted to 12v and a modern GM alternator has replaced the factory generator. I was given a generator and voltage regulator with the truck; no idea if they are stock to the truck (6v) or 12v parts as I haven't examined them that closely (they are still in the box of parts I got with the truck).
