Adding a Dual Battery

Nasty · October 23, 2018

19 minutes ago, Sloverado said:

Bringing up old thread. I am looking to do this upgrade and I’m also have another question maybe someone can answer. I have a 170 amp alt and was wondering if the 84143539 220 amp would be a replacement for it? I have a 17 with the 6.2. My dealer ship wasn’t much help when asking

Id grab a real HO alt myself. Stock alts or meh. Dc power or US alternators. Our stock 170 atls probably only put out 100-120 amps hot.

tenscourts · October 23, 2018

Bringing up old thread. I am looking to do this upgrade and I’m also have another question maybe someone can answer. I have a 170 amp alt and was wondering if the 84143539 220 amp would be a replacement for it? I have a 17 with the 6.2. My dealer ship wasn’t much help when asking

If you just want the higher amp alternator for the dual setup I can attest you don't need it. The stock will maintain them both no problem. If you need it for another purpose please report your findings. I've had a dealer tell me changing the alternator required programming. I don't know that I believe them but with these trucks it wouldn't surprise me. On a side note I can also attest that when you accidentally run your primary battery too low to crank your truck the secondary will definitely do the job. Linked mine via the push button on my ACR and she cranked right up!

Sent from my Pixel 3 XL using Tapatalk. My build thread: http://www.gm-trucks.com/forums/index.php?/topic/192614-Tenscourts'-2016-LTZ/Z71-CCSB-4WD-Silverado

Sloverado · October 23, 2018

Is this the correct tray to add a second battery then? it doesn’t look to be but the the part number for my 17 doesn’t match what was on here

Edited October 23, 2018 by Sloverado

bsprtsgrp · October 23, 2018

I believe you would need part number 22989633 for the correct battery tray and the tie-down

csoldfield · October 23, 2018

I can confirm 22989633 - here's it mounted in my 2017 Silverado

Sloverado · October 24, 2018

Thanks I got the tray, bolt, and holder on order along with another battery.

BrianABP · November 15, 2018

On 10/23/2018 at 3:57 PM, csoldfield said:

I can confirm 22989633 - here's it mounted in my 2017 Silverado

Super Clean Install! Love it!

2003 SSEi · November 15, 2018

does anyone who did this have a part number listing for the dual battery cables? Id like to do this on my 14 Denali.

RACERX7775 · November 22, 2018

If you wanna go completely factory for the second battery, it's alot of work. When i did mine, i made my own cables. The routing is totally different. I just went from + batt1 to + batt2. I also did + from alt to + batt2. - from batt2 to engine and chassis. All of my aftermarket stereo power gets power from batt2.

Edited November 22, 2018 by RACERX7775

RACERX7775 · November 22, 2018

This just shows the breakers from batt1 to batt2.

Edited November 22, 2018 by RACERX7775
Add content

1SLOW1500 · November 22, 2018

This just shows the breakers from batt1 to batt2.

That means you just have a bigger single battery system. Also the charge system doesn't know the difference and also you can hurt both batteries. Been there done that.

Sent from my SM-N950U using Tapatalk

1SLOW1500 · November 22, 2018

I believe you would need part number 22989633 for the correct battery tray and the tie-down

Battery tray isn't needed the factory tray works with some batteries and with Optima batteries as they come with the adapter. All you need is the hold down $7 part. I did this on my truck and posted pics.

Sent from my SM-N950U using Tapatalk

Nasty · November 22, 2018

5 hours ago, RACERX7775 said:

If you wanna go completely factory for the second battery, it's alot of work. When i did mine, i made my own cables. The routing is totally different. I just went from + batt1 to + batt2. I also did + from alt to + batt2. - from batt2 to engine and chassis. All of my aftermarket stereo power gets power from batt2.

Are both grounds going through the battery current sensor? If not youll run into high charge issues

1SLOW1500 · November 22, 2018

If you just want the higher amp alternator for the dual setup I can attest you don't need it. The stock will maintain them both no problem. If you need it for another purpose please report your findings. I've had a dealer tell me changing the alternator required programming. I don't know that I believe them but with these trucks it wouldn't surprise me. On a side note I can also attest that when you accidentally run your primary battery too low to crank your truck the secondary will definitely do the job. Linked mine via the push button on my ACR and she cranked right up!

Sent from my Pixel 3 XL using Tapatalk. My build thread: http://www.gm-trucks.com/forums/index.php?/topic/192614-Tenscourts'-2016-LTZ/Z71-CCSB-4WD-Silverado

Without a isolator then when the truck dies both batteries are dead. It will not start. Also one battery goes weak and the other will suffer. Charge system will have a hell of a time.

Sent from my SM-N950U using Tapatalk

RACERX7775 · November 22, 2018

I wasnt looking to isolate either of them. It was more of a way to keep voltage spikes at a min from the stereo system. This isnt my first time doing this thing. If done right, you wont hurt anything. I had these in the back of my excursion with 2 more up front.

Edited November 22, 2018 by RACERX7775