Dual Battery Installation

sdeeter19555 · June 17, 2017

Wow, I did mine for about $150... $75 for the battery, $75 for the custom battery cables made to order...the battery hold down cost $3.

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djxn40 · June 25, 2017

I considered going this rout when my battery died. Instead I just replaced mine with a beast of a battery them mounted a 50. Cal ammo box to my second tray. It makes a great place to carry an extra gun or if I take mine off and need to lock it in the truck. Feels safer under the hood

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Edited June 25, 2017 by djxn40

SandyNeck · June 25, 2017

I found this posting to be very informative:

http://www.silveradosierra.com/how-to-articles/how-to-hook-up-dual-batteries-factory-style-t284010.html

It describes OEM style installation and lists parts, tools & sources required to perform it. Highly recomended reading for anyone considering installation of an Auxillary Battery and wanting to keep their truck in factory style.

I had the TP2 Auxilliary Battery option on my old Silverado and found it to be very convenient. Sorry to see they don't offer it on current 1500 series, especially since the battery tray is already there.

Edited June 25, 2017 by SandyNeck

Remy27 · July 21, 2017

Not sure if this will help anyone, but In my old 08 Sierra I installed a second battery with a Cole Hersee isolator. I also was able to get relatively cheap 1/0 cable and terminals from the local Airgas welding supply store. They are made for welding, but are much better and cheaper then most automotive cables (also had to buy a special terminal crimper.) I mounted my inverter under my driver side rear seat. There's a spot near it under the carpet where you can easily drill a hole and use a grommet to protect the cables. I also ran a waterproof heavy duty cord in to the bed of the truck. Worked really slick. Was able to run a TV, stereo and lights for about 4 Hrs without having to start the truck back up. With the truck running I could and did actually run a sawzall! In all I probably spent $800 for everything including the optima yellow top battery. I may put it in the new truck but haven't gotten around to it yet. Hope this helps.

higsy · November 23, 2018

Hi. I'm new to the site and a little late to this party but I'm installing a second battery in my 2018 Silverado . I'm using the OE isolator and need to hook it up using a 12v source and also a 12v switched source. There seems to be alot of information on gmt900 but not the newer style trucks.

Does anyone have information on tapping the under hood fuse box to get the power? It's quite different than the previous gen.

Thanks

Edited November 23, 2018 by higsy

dsatwork · January 31, 2019

On 11/23/2018 at 8:08 AM, higsy said:

Hi. I'm new to the site and a little late to this party but I'm installing a second battery in my 2018 Silverado . I'm using the OE isolator and need to hook it up using a 12v source and also a 12v switched source. There seems to be alot of information on gmt900 but not the newer style trucks.

Does anyone have information on tapping the under hood fuse box to get the power? It's quite different than the previous gen.

Thanks

It's not cheap but this one listed earlier in the thread is still an option.

http://www.atct-guardiansys.com/

Remy27 · February 1, 2019

On 11/23/2018 at 11:08 AM, higsy said:

Hi. I'm new to the site and a little late to this party but I'm installing a second battery in my 2018 Silverado . I'm using the OE isolator and need to hook it up using a 12v source and also a 12v switched source. There seems to be alot of information on gmt900 but not the newer style trucks.

Does anyone have information on tapping the under hood fuse box to get the power? It's quite different than the previous gen.

Thanks

I ended up using one of the free spots on the battery distribution block and a Wirthco Battery Isolator for my dual battery setup. (https://www.amazon.com/gp/product/B0058SGDFK/ref=ppx_yo_dt_b_asin_title_o08__o00_s00?ie=UTF8&psc=1) Be careful with the distribution block, make sure you have it disconnected from the battery. I forgot this step and fried the fuse to the starter and ended up having to replace the whole block.