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How to hook up dual batteries - factory style

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Re: How to hook up dual batteries - factory style

Postby Tomcat2 » Mar 02 2018, 10:02pm

Will someone please tell the primary purpose of duel battery set up
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Re: How to hook up dual batteries - factory style

Postby CardBoard » Mar 02 2018, 10:29pm

Have a System in your truck ? Have a snow plow or wench on the front ? extra lights and inverters ? Whatever you want it for, and NOT use your main battery.
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Re: How to hook up dual batteries - factory style

Postby LawDogg8026 » Apr 02 2018, 6:00am

This was a great read.
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Re: How to hook up dual batteries - factory style

Postby Timster » Jul 01 2018, 9:43pm

I did the Dual Battery upgrade on my 2013 1500, I also upgraded all the battery cables.
Now after turning off the motor, but leaving the key in the accessory position, I get a warning that the battery is low and I should start the truck.

Has anyone else seen this or know of a fix?

I'm guessing it's because of the second battery and new ground cables. The main ground cable goes through a sensor, so I believe it's just not reading correct now.
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Re: How to hook up dual batteries - factory style

Postby mkolenski » Aug 11 2018, 4:27pm

Anyone know if this will work for my 2018 1500 with 6.2L ?


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Re: How to hook up dual batteries - factory style

Postby higsy » Oct 25 2018, 9:06pm

Anyone know how close this is for the install on a 2018?
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Re: How to hook up dual batteries - factory style

Postby higsy » Nov 20 2018, 6:07am

The fuse block is totally different on the 2018 and I'm looking for a 12v source and a switched 12v for the harness for the isolator harness. Any ideas ?
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Re: How to hook up dual batteries - factory style

Postby vukiclab » Oct 20 2019, 8:03pm

Hello, all! Thank you for a great thread!

Any chance someone knows the number for the original ACDelco auxiliary battery harness that would fit a 2016 Sierra 1500? I am trying to save some time.

Thanks a lot!
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Re: How to hook up dual batteries - factory style

Postby vukiclab » Nov 12 2019, 3:58am

I managed to find the information I was looking for in my previous post, and am finishing up my factory-style setup on a 2016 Sierra 1500.

The harness part # for this age is 23273450. It replaces the original wire that runs from the primary battery to the underhood fuse box. It comes with the relay that actuates the bigger relay that disconnects the batteries (i.e., secondary auxiliary relay), and includes the auxiliary battery positive terminal with a 125A fuse holder adjacent to the terminal. However, the cover for this single-fuse box is a separate part # 22945779. If you would like to directly draw high gauge cables to accessories (e.g., inverter), you can buy the 3-fuse holder from older models (19116352 and cover 15881616) so you get a 100% factory install with provision for accessories. This 3-fuse holder can replace the single fuse holder that comes with the aforementioned harness and in that case sits on the battery just like the single-fuse box would. The distribution block on the primary battery already has a blank 125A spot for the auxiliary battery harness, so no modifications are needed there - just some nuts (should be 21021808).

Auxiliary battery negative terminal with the wire should be 84354708 (I am still waiting for this last part).

The secondary auxiliary relay part # is 12135194. You will have to use either self-tapping screws or rivet nuts to mount it to the firewall, as described earlier.

Battery tray part # is 22989633, retainer is 14005061, and the retainer bolt is 11519527.

Next, you need the "X158 Auxiliary Battery Harness to Engine Harness" that supplies ground, (+), and the signal for the relay to the aforementioned auxiliary battery harness (if you don't want to make the connector yourself). Service connector part # is 19367564. If you want to go full-factory, you can get violet/brown and red/white wires online. The black (ground), I connected to the ground post on the firewall where the relay is mounted.

The violet/brown connects to pin 42 of "X115 Engine Harness to Body Harness" connector near the underhood fuse box and the auxiliary battery. The "body" side of the connector is very accessible and there is already a violet/brown wire that you can tap into. The red/white needs to go to pin G6 of connector X2 of the underhood fuse box - there was no pin in there so I used the terminated lead 19301767. I already had the F52UA fuse installed - that one will supply power for the auxiliary relay.

Everything works but I am surprised that the relay disconnects the batteries during cranking. Can someone confirm how the system operates? I was expecting the auxiliary battery to "help" during the cranking. I can clearly hear the relay engage when the key is in ON, but disengages during cranking, and engages again when the cranking is over.

Thank you!
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