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Any car battery will work. Group 51 is close to stock. The 100 amp system was overcharging due to the voltage regulator being set too high. It’s on the firewall. Admittedly the early 100 amp systems with the selenium rectifier failed frequently (they burned up, the thing in the grille), but...

Cool! As suspected, the 100 amp alternator has been replaced. Does your contact there have more stuff that needs re-homing?

Chances are the 100 amp system has been replaced with the 25 amp system. The 100 amp system was not very reliable, especially the rectifier in the grille. The star is supposed to point forward. The heater under the dash is aftermarket. Can't wait to see you fix it up like the 5 ton. This...

Truck was restored to include sandblast and paint at some point, then they left it in the weather for 20 years. Sad. Got some cowl rust, fixable. See the off center device behind the front grille? That is the selenium rectifier, part of the 100 amp charging system, which was installed on...