Aux battery question.

[Rotorgeek]

I just bought a National Luna Portable Power Pack and I plan to mount it in the bed of my truck. I’m going to need to put an auxiliary fuse box under the hood. Is there a reason I need to run a ground wire from the Power Pack to the fuse block or just use the common ground like the truck or the black lead from the main battery?

 

[damienperu]

without further info on the setup, its a bit hard to give any decent advice, but given your fuse box (run from the aux bat i assume) is in the engine bay, ground it to bolt where the primary battery is grounded to the chassis, and given the aux power pack should be connected to the primary battery ground terminal for the best charging, all bases will be covered. you could also just connect to any metal surface and chances are it will work without problem for normal use.