Join Date: Sep 2014
Location: Black Diamond, WA
Thanked 243 Times in 208 Posts
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So you have a diesel heater like a Webasto heater, and the fan pulls off of the truck batteries, but you can plug in the truck at the same time your running the heater and use a charger to keep the truck batteries charged?
If that's the case, you want a charger with more amps than a maintainer if you're using enough juice without the truck running to require charging.
And since your presumably running the heater when its cold out and risk the truck not starting if it's not plugged in, then you'd be best off to put a house battery or 2 in the system and a charging relay.
Regardless, for a charger for your purposes unless my assumptions are wrong, I'd look at a single or dual bank onboard marine charger/maintainer. 10amp min per battery.
07 5.9 Mega, G56, SB Single disk Ceramic clutch, OE 1 piece Al driveshaft, 60hp Industrial injectors, Triple dog, Glacier 2mic filter, BD exhaust brake, ATI Super Damper, BD steering brace, Firestone bags, Big Wig swaybar, 4th Gen 20s and some home made Stableloads.