No power in the car

Sorry, didn't mean to hit disagree there Mattax lol. Very helpful diagrams. He actually does have a rear window defroster, that must be what those are connected to the ammeter. Studs were in such poor condition they snapped when he tried to undo the nut. We got a spare dash, and we have electrical tape and heat shrink for new connections. Will have to split the sheathing on that positive wire to see how far the corrosion goes.