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Bart2500HD

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Bart2500HD Enthusiast

Bart2500HD

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Posted

Can anyone tell me how the auxiliary battery is wired to the truck's electrical system? Is this battery just for extra capacity for accessories or is it used all of the time and has it's charge maintained by the alternator? After my son left the headlights on over the weekend, I was wondering if a disconnect could be installed to enable the auxiliary battery to be able to start the truck.

builderpaul Enthusiast

builderpaul

Posted
Posted

It depends on which option you ordered. GM has 2 dual battery options.

RPO code 8BO is an isolated 2nd battery. This is best for running accessories. It is not connected to the main (starting) battery so it can be run all the way down and truck will still start. If you also have the trailer option this battery is wired to the 12v power terninal of the trailer connector. If you are adding amps, inverters etc you would want to wire to this battery. This battery charges when the truck is running. But will not provide starting power. If your main is run down you could use jumper cables from the aux to the main for starting.

The other option (I don't know the RPO) is just another battery connected to the main. This will give you additional starting power. This is a cheaper option and I think is standard on the duramax.

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