Hi I have duel batteries in my truck that are dead after sitting all winter and need to jump them.what battery should I hook up to.It’s a 2016 gmc 6.6 duramax

diver57 wrote:Hi I have duel batteries in my truck that are dead after sitting all winter and need to jump them.what battery should I hook up to.It’s a 2016 gmc 6.6 duramaxDoesn't matter. They are both connected in parallel. If I were doing it to my Duramax, I'd do it to the one behind the headlight, because that's the most convenient to reach with a set of jumpers cables.

It doesn't matter at all. Hook it to which ever battery you want too.It's entirely possible, if they've been dead for several months, that they need to be replaced. But, try to jump it off, charge them up, and see what happens.

Jumping dead batteries on digital truck brings some horror stories it can trigger.Pull the batteries out and charge them. If they will recharge, than put them back, if not get new batteries. New batteries are still cheaper than fried ECM.

diver57 wrote:Hi I have duel batteries in my truck that are dead after sitting all winter and need to jump them.what battery should I hook up to.It’s a 2016 gmc 6.6 duramaxIt’s not that cold in Surrey that two, 2 year old batteries would die. I live in the Kootenays which is way colder than Surrey in the winter and way hotter in the summer. The batteries in my 2007 Duramax lasted 8 years, actually they were still half decent, but it was time to change them, life was 1 year past usual life of a battery in our climate. I never plugged in the truck here in the winter, unless I go to the kids place between Banff and Calgary. Now I’m not a Mechanic, and not even close. I know enough to get my self into trouble and that’s about it.However two, 2 year old batteries die because the truck wasn’t run over the winter.... you have a large power drain someplace. The little scurity system in the radio, I don’t think would kill two basically brand new batteries, becuase the truck sat for 5 months. I would be talking to a GMC teck, as well ensure all your cable connections are clean and tight, as a loose wire on either battery will help to kill a battery. Soup.

No man... a loose wire will not kill an idle battery. It can make it not charge well when the engine is running and that will make it drain. The best battery to jump a late model Duramax from is the passenger side one. That’s it’s “primary” battery. Yes, they are both connected in parallel and it will work either way, but the passenger side has the most direct connection to the starter. The driver side battery goes through longer cables before it reaches the starter. If you jump from that side there’s more resistance. Like I said either side will work, the passenger side will work a little bit better. But not much. Not enough to stress over it if it’s inconvenient to reach the passenger side. Another thing you can do is hook up two sets of jumper cables. That reduces the resistance and flows more current. It’ll start sooner that way.

Battery boosting | Good Sam Community

12 Replies

KD4UPL
Explorer II
Jun 14, 2018
It doesn't matter at all. Hook it to which ever battery you want too.
It's entirely possible, if they've been dead for several months, that they need to be replaced. But, try to jump it off, charge them up, and see what happens.
deltabravo
Nomad
Jun 14, 2018
diver57 wrote:
Hi I have duel batteries in my truck that are dead after sitting all winter and need to jump them.what battery should I hook up to.
It’s a 2016 gmc 6.6 duramax

Doesn't matter. They are both connected in parallel. If I were doing it to my Duramax, I'd do it to the one behind the headlight, because that's the most convenient to reach with a set of jumpers cables.

Forum Discussion

Battery boosting

12 Replies

About Travel Trailer Group

Related Content

Battery Boost Issue

House battery drain

Battery Boost Not Working

How to boost charge AGM batteries in storage?

Two questions: fridge OOPS! and battery boost relay