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Adding a Dual Battery

bsprtsgrp
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Nasty Senior Enthusiast

Nasty

Posted
Posted
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.  

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tenscourts
tenscourts

I've gone through this entire process. See my build thread and pm me if you need additional info. BTW the OE battery size will not fit the second tray. Again, read my thread. I have part #s, pictures,

Vuk
Vuk

This is the battery tray, secondary auxiliary relay, and the optional 3 fuse box and cover for older model years if you want to replace the single fuse box on the aux battery harness:

Vuk
Vuk

My setup is complete now with nice factory-looking points to hook up an inverter. Should I ever need to jump start the primary battery, I can always run jump cables from aux battery to the primary.

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tenscourts Enthusiast

tenscourts

Posted
Posted
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 Enthusiast

Sloverado

Posted
Posted (edited)

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

6C17237E-BA8F-469D-BA9F-04E9C4DD87B4.jpeg

Edited by Sloverado
bsprtsgrp Enthusiast

bsprtsgrp

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Posted

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

 

 

130221TK02-208.JPG

  • 4 weeks later...
BrianABP Enthusiast

BrianABP

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

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

IMG_20180302_075006.jpg

IMG_20180318_153602.jpg

IMG_20180318_153611.jpg

Super Clean Install!  Love it!

2003 SSEi Enthusiast

2003 SSEi

Posted
Posted

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 Enthusiast

RACERX7775

Posted
Posted (edited)

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.

20180523_192637.jpg

Edited by RACERX7775
RACERX7775 Enthusiast

RACERX7775

Posted
Posted (edited)

This just shows the breakers from batt1 to batt2.20180519_170215.jpg

Edited by RACERX7775
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1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
This just shows the breakers from batt1 to batt2.20180519_170215.thumb.jpg.58dc03ed80ef652a0f5ce6984ce2f6e5.jpg
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.

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1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
I believe you would need part number 22989633 for the correct battery tray and the tie-down
 
 
130221TK02-208.thumb.JPG.4d05fa25dddb6d90de4ddca59c1d3f6a.JPG
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.

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Nasty Senior Enthusiast

Nasty

Posted
Posted
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.

20180523_192637.jpg

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

1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
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

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RACERX7775 Enthusiast

RACERX7775

Posted
Posted (edited)

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.

20140507_093122.jpg

Edited by RACERX7775

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