New Gmc 3500hd Need Dual Battery

RONK · August 31, 2011

I just bought a new GMC 3500HD 6.0,to find one with a dual battery setup but there were none around.I priced the parts from the dealer and it came to over $800,online it was about $300,what are my options?I'm using the truck to plow with.Thanks.

TP@CLNC · August 31, 2011

I just bought a new GMC 3500HD 6.0,to find one with a dual battery setup but there were none around.I priced the parts from the dealer and it came to over $800,online it was about $300,what are my options?I'm using the truck to plow with.Thanks.

I thought all the 3500's came with dual battery setups? Mine has the Duramax but it has dual batteries, so maybe it's an option if you have the 6.0? There's a few articles on here where guys added a second battery and it was pretty reasonable and not too hard of a setup. Try a search or hopefully someone on here will be able to give you the link. Congrats on the new truck, post some pictures.

This is from my build sheet "IUV-. H,D, DUAL 730 CCA BATTERY"

Kirkathon25 · August 31, 2011

i just put a second battery in my 2500hd 6.0L. i hooked the positive to the jump start post on the drivers side of the engine. and i just grounded it on the firewall next to it. have to either make a tray or buy the factory one tho. its great tho cannot kill the batteries, had 3 amps and an inverter running for hours and they would not die. i think that there is some sort of a switch tho that is associated with it to avoid blowing your starter up, im sure someone with more info will jump in

dmax3500 · August 31, 2011

just buy the gm tray on the rear passenger side[$35], then buy the factory poss cable[about $75.00],go to an auto parts store and buy the neg cable[$20]

Doug_Scott · August 31, 2011

You will want the isolator as well. Simply running two batteries like you are boosting is not the more ideal setup.

Diesail · September 2, 2011

You will want the isolator as well. Simply running two batteries like you are boosting is not the more ideal setup.

If he is looking for more capacity for plowing then he does not want the isolator. Battery tray and cables is all that is needed. You will want to ground the battery to the block and run the positive cable to the starter. You good source for cables is Genuinedealz.com While the section of the site for custom cable assemblies refers to them as "inverter cables" they can make you anything you need.