Chevy Auxillery Battery
I have always been curious about the auxiliary battery that is in my 2001 Chevy Silverado 2500 HD. According to the manual, this battery is for if using a truck camper? That would lead me to believe...
Forum Discussion
colliehauler wrote:
I guess I never seen a gas truck with two batteries. If they are hooked up in parallel you need to replace both.
Mkirsch in the post above explains why.
on gm with gas truck, the second battery is connected to the trailer pigtail through a relay. It charges from the alternator when the truck is running, but the 12V ONLY connects to the trailer pigtail.
at least it was in 2004 and up through 2015 on the 2500/3500 series.
On the diesel the two batteries are connected directly to the pigtail, no relay involved. Not good IMHO.
the second battery on gas vehicles is a factory option.
