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Vermont, IL | Sounds like what you need is a battery isolator. Something like this:
https://www.etrailer.com/Battery-Charger/Deka/DW08771.html?feed=npn&...
I don't remember what brand I have but have used it for years in the service truck. It keeps the aux. battery charged which is used for the transfer pump, 2 way radio, starting battery for the air compressor and ranger 8. You could also power an inverter. | |
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12v power service truck bed
