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It is interesting what people did to the electrical systems on these trucks. We ran 2 civil defense brush trucks for many years with 12v tapped off the first battery for 30 years. We replaced batteries as they went bad 1 at a time. They always made it out of the warranty period. The 12 volt was for a single radio and 4 flashing emergency lights hooked up to a turn signal flasher or a single beacon. We also had aftermarket turn signal kits that were 12 volt. While I agree now none of this is the best way, it worked. Keep in mind battery chargers were used to top them off while they sat. I assume that compensated for the drain on the 1 battery. We checked electrolyte levels every Monday as it would cook out of the battery form overcharging.
I believe the charging system in your truck may only be 25amps. If you have any battery issues that cause a drain, the generator is not able to compensate very much.
I believe the charging system in your truck may only be 25amps. If you have any battery issues that cause a drain, the generator is not able to compensate very much.
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