Dual Batteries - How does it work? - Chevy and GMC Duramax Diesel Forum
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post #1 of 19 (permalink) Old 12-13-2019, 08:23 AM Thread Starter
 
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Dual Batteries - How does it work?

I purchased my DMax in the summer. Now that winter is here, I was wondering about how the two batteries work? Are they simply interconnected or is one used for certain loads and the other for other functions? If I want to park the truck for several weeks, do I need 2 float chargers?

I guess I should pick up a "Haynes" for the electrical diagrams...
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post #2 of 19 (permalink) Old 12-13-2019, 08:28 AM
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Wired in parallel, they're two halves of one large battery. Not two singles with different uses.

One float hooked to either will work, or a cig light/aux port plug-in with a solar panel to lay on the dash (if parked outside).
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post #3 of 19 (permalink) Old 12-13-2019, 09:34 AM Thread Starter
 
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Perfect.

Going south for a few weeks this winter (without the 5th wheel!) and the truck will be in the garage for that period.

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post #4 of 19 (permalink) Old 12-13-2019, 02:56 PM
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I guess I should pick up a "Haynes" for the electrical diagrams...

Wiring diagrams are available at GMUPFITTER.COM - no cost.
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post #5 of 19 (permalink) Old 12-13-2019, 03:04 PM
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If it's only for a few weeks I wouldn't even worry about it.

Of course a maintainer (as opposed conventional charge only device) isn't going to hurt.


There is a way to set them back to shipping mode and use even less power.

https://www.dieselplace.com/forum/at...130_204806.jpg


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post #6 of 19 (permalink) Old 12-13-2019, 03:33 PM
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Since you just purchased it, this thread may be of interest/use to you in maintaining it.........+ some other useful information:

https://www.duramaxforum.com/forum/m...ew-owners.html

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post #7 of 19 (permalink) Old 12-13-2019, 04:54 PM
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Quote:
Originally Posted by David Jay View Post
I purchased my DMax in the summer. Now that winter is here, I was wondering about how the two batteries work? Are they simply interconnected or is one used for certain loads and the other for other functions? If I want to park the truck for several weeks, do I need 2 float chargers?

I guess I should pick up a "Haynes" for the electrical diagrams...
Both - are connected to each other, both + are connected to each other. They are electrically 1 single 12V battery.

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post #8 of 19 (permalink) Old 12-13-2019, 08:04 PM
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Quote:
Originally Posted by David Jay View Post
I guess I should pick up a "Haynes" for the electrical diagrams...

If you would rather have factory manuals they are available from Helm Inc.

Pricey, but very comprehensive.


https://www.helminc.com/helm/Result....ected%5Fmedia=

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post #9 of 19 (permalink) Old 12-13-2019, 08:20 PM
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Quote:
Originally Posted by redwngr View Post
If it's only for a few weeks I wouldn't even worry about it.

Of course a maintainer (as opposed conventional charge only device) isn't going to hurt.


There is a way to set them back to shipping mode and use even less power.

https://www.dieselplace.com/forum/at...130_204806.jpg

Start engine .... and then turn key to start position sounds like a problem. I hope a few brave souls try this before I do.

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post #10 of 19 (permalink) Old 12-13-2019, 08:36 PM
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There's logic in the ecm to keep the starter from engaging when the engine is running.

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