Jump to content

Dual battery setup

Gr8FrozenNorth
 Share

Recommended Posts

48548 Enthusiast

48548

Posted
Posted

Here is the stock and added ground and current pics... sorry for how dirty the engine is... 8 years old this may... 500a92a1902d2c39d01b88d7b50e8fb1.jpgf39b6c9c6b5555c94a3d457e43857ff2.jpg3377a2ff96987d2a94e86429263576b4.jpgd532bf9566214da44382d0bcc99beb69.jpgc68b4bc9d99b6bc5345c7bd506643a33.jpg18aacca1197a1473bbc488ff6c093a11.jpg913c81923a251808eb3594eb5e1ea2b8.jpg

Sent from my SM-N975U using Tapatalk

  • 1 year later...
  • Replies 35
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

mkeddie
mkeddie

I paid the small amount to have the dual battery installed at factory it's alot easier that way lol     Sent from my Moto Z (2) using Tapatalk        

mkeddie
mkeddie

Stay tuned and u will see all my fun Sent from my Moto Z (2) using Tapatalk

redwngr
redwngr

And now the factory dual alternators are a 220 with a 170    KHF         Alternators, dual, 220-amps primary, 170-amps auxiliary 1 - With (L8T) 6.6L V8 gas engine, (K4B) 730 cold-cranki

Posted Images

BrentH Enthusiast

BrentH

Posted
Posted

@Gr8FrozenNorth : did you ever complete this operation of adding the auxiliary battery and increasing the alternator capacity?

 

I just purchased a 2021 2500HD LT and they "forgot" to install the package or couldn't due to missing parts.  Anyway I have the parts ordered and a new 220 volt alternator on the way and will be doing this mod in a few weeks when everything arrives.

 

My truck arrived with the 170 Amp Alternator but has a 250 amp fuse for the alternator on the main battery.  For a 170 amp alternator this would normally be a 175 amp fuse.  For some reason my fuse block is from a 1500 Diesel with a 220 Alternator - for me, that is a good thing :)

 

I purchased the " J Block Auxiliary Battery"  84663447 - this part comes with a 30 amp fuse, a 100 amp fuse and a 175 amp fuse.  The 100 amp fuse is connected to an isolator relay all as one assembly.  The cover is Junction Block Cover 84471670

 

I am re-using the cable from the main battery positive to the terminal on the X50D (175 amp) it runs from the main battery over to the X50A Fuse Block (as per normal) and then a short pigtail will run from that connection to the 100 AMP fuse on the auxiliary battery J Block (X50E).  this is the fuse attached to the isolator.

 

The isolator is supposed to be powered from a secondary relay that wires into a connector X136.  I have to find all that on the truck first but I am away on business so it will take a bit.  right now I am still in research mode but it looks like that is pretty much it other than connecting the trailer 30 supply power wire up.

 

From reading the battery relay will energize if you switch to tow/haul mode and it will charge the aux battery. 

 

maybe someone with the factory install would have more intel.  I will post pictures once things get underway.  

Rozz522 Enthusiast

Rozz522

Posted
Posted

I'm wondering if anyone has had their dealer do an install much like the factory install? I just put a deposit on an in transit SLE with the Snow Plow Prep so I will have the 220A alternator. I would just need the battery, the new junction/fuse box and the additional leads. I know as a factory install its like a $135 install but looking at the parts list it looks significantly more as an after the fact installation. I just wasn't sure if there was a retrofit kit for the dealer to order of if you need to identify and order the individual parts needed.

Another JR Senior Enthusiast

Another JR

Posted
Posted

My new 3500HD gas truck arriving next week will have the factory dual battery installation.  If you would like me to post photos of anything let me know.  I'm going to be immediately installing 6awg wire to a slide in camper connector (for a 30 amp DC-DC converter/charger in the camper), so figuring out the battery, isolator, and fuse block arrangement on the truck will be one of the first things I get into.

  • Like 1
  • 3 months later...
Dare Wade Enthusiast

Dare Wade

Posted
Posted
On 4/8/2021 at 7:09 AM, Another JR said:

My new 3500HD gas truck arriving next week will have the factory dual battery installation.  If you would like me to post photos of anything let me know.  I'm going to be immediately installing 6awg wire to a slide in camper connector (for a 30 amp DC-DC converter/charger in the camper), so figuring out the battery, isolator, and fuse block arrangement on the truck will be one of the first things I get into.

Please do post the set up. 

03 Cobra Enthusiast

03 Cobra

Posted
Posted
On 4/8/2021 at 10:09 AM, Another JR said:

My new 3500HD gas truck arriving next week will have the factory dual battery installation.  If you would like me to post photos of anything let me know.  I'm going to be immediately installing 6awg wire to a slide in camper connector (for a 30 amp DC-DC converter/charger in the camper), so figuring out the battery, isolator, and fuse block arrangement on the truck will be one of the first things I get into.

 

Yes, please post pics of your factory dual battery set up.  Now that you've had it a few months are you happy with its performance?  I have a 22 GMC HD ordered with that option and I'm very anxious to see what it looks like from the factory.

  • Like 1
Another JR Senior Enthusiast

Another JR

Posted
Posted

I will take some pictures later this evening. I have not yet wired anything to the second battery. I ordered the option because it was way cheaper than adding the battery system later, and eventually I’ll use it to power an air compressor or refrigerator or both. The factory wires the trailer 12 volt supply to the aux battery. No other loads are on it right now, so I can’t give a report on using the aux battery yet. 

03 Cobra Enthusiast

03 Cobra

Posted
Posted
1 hour ago, Another JR said:

I will take some pictures later this evening. I have not yet wired anything to the second battery. I ordered the option because it was way cheaper than adding the battery system later, and eventually I’ll use it to power an air compressor or refrigerator or both. The factory wires the trailer 12 volt supply to the aux battery. No other loads are on it right now, so I can’t give a report on using the aux battery yet. 

 

From research I've done recently including chatting in another forum with a guy that has a 2020 Chevy HD with the factory dual batteries I believe that the second battery powers the trailer connections (4 pin and 7 pin) when the truck is turned off and when the truck is running both batteries get charged.  That way you can power your RV with the truck off and not worry about draining your starting battery.  He traced the wiring using schematics he found online and then tested his truck with a meter to confirm it.  I haven't been able to check it myself yet but he seemed to be confident and knowledgeable on what he was talking about.  Is that aligned with your understanding?

Another JR Senior Enthusiast

Another JR

Posted
Posted

I believe all of that is correct except my understanding is that only the trailer positive (pin 4) is powered from the aux battery, and pin 7 is reverse lights.  That’s my understanding of standard 7 pin trailer connector wiring, but I have not tested pin 7 to see how it’s actually wired on my truck. 

03 Cobra Enthusiast

03 Cobra

Posted
Posted
10 hours ago, Another JR said:

I believe all of that is correct except my understanding is that only the trailer positive (pin 4) is powered from the aux battery, and pin 7 is reverse lights.  That’s my understanding of standard 7 pin trailer connector wiring, but I have not tested pin 7 to see how it’s actually wired on my truck. 

 

Did a quick search and found the below diagram.  It will be interesting to know which pins have power when the truck is completely off.

 

image.png.ecf882f7a96263f0bf74c0dbe613d4b7.png

Another JR Senior Enthusiast

Another JR

Posted
Posted (edited)

I just used a voltmeter and confirmed that only pin 4 has 12 volts on it when the truck is off and no lights are on. 
 

i’m not sure what you would like pictures of, so to start here is a view of the general battery installation and one of the i fuse block. The 30 amp fuse is connected to pin 4 of the trailer connector. The 100 amp fuse comes from the main battery fuse block.  

 

My truck has a gas engine with single alternator. The aux battery option includes a larger 220 amp alternator. My understanding is that on diesels the second battery is a parallel wired starter battery with no isolator. 
 

 

 

F88986E3-D103-46F3-B9C5-ED28CB801C0F.jpeg

C47AED5E-1EFF-4452-878E-B47B244D3E8B.jpeg

Edited by Another JR
03 Cobra Enthusiast

03 Cobra

Posted
Posted (edited)
8 hours ago, Another JR said:

I just used a voltmeter and confirmed that only pin 4 has 12 volts on it when the truck is off and no lights are on. 
 

i’m not sure what you would like pictures of, so to start here is a view of the general battery installation and one of the i fuse block. The 30 amp fuse is connected to pin 4 of the trailer connector. The 100 amp fuse comes from the main battery fuse block.  

 

My truck has a gas engine with single alternator. The aux battery option includes a larger 220 amp alternator. My understanding is that on diesels the second battery is a parallel wired starter battery with no isolator. 
 

 

 

 

 

 

Another JR, hey thanks for checking the volts and confirming that only pin 4 is hot.  Also, the pics are great.  I just wanted to see what the factory set up looks like.  The aux battery definitely fills the hole that is in that corner of the engine bay when the battery isn't there. I like that it's wired so the aux battery is disconnected without us needing to do anything.

Edited by 03 Cobra
  • 5 weeks later...
hdhp Enthusiast

hdhp

Posted
Posted

Hi all according to my dealer I should have my 2022 Silverado 2500HD in 2 weeks. (I have a build date of 8/30/21!)

 I ordered the dual Battery/Alternator option. Dose anyone on here know how this setup works? (Just incase my dealer is not suer) Is one battery just for the truck and one for a camper? I have had dual battery setup in some of my other vehicles but I installed them with a battery isloator. I plan on having a slide in pop up truck camper that I will be putting to good use this winter! Im from Michigan so its south or west for me! Thanks all! I posted this in other sections a lot of views but no reply....

 

HDHP

 

redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)

On the dmax they are all dual the batteries which behave as one big one.

 

Not sure about on the gasser

Edited by redwngr
  • Like 1
03 Cobra Enthusiast

03 Cobra

Posted
Posted
15 hours ago, hdhp said:

Hi all according to my dealer I should have my 2022 Silverado 2500HD in 2 weeks. (I have a build date of 8/30/21!)

 I ordered the dual Battery/Alternator option. Dose anyone on here know how this setup works? (Just incase my dealer is not suer) Is one battery just for the truck and one for a camper? I have had dual battery setup in some of my other vehicles but I installed them with a battery isloator. I plan on having a slide in pop up truck camper that I will be putting to good use this winter! Im from Michigan so its south or west for me! Thanks all! I posted this in other sections a lot of views but no reply....

 

HDHP

 

 

On the gas trucks the aux battery is charged when the truck is running.  When the truck is off only pin 4 on the 7 pin round trailer connections is powered by only the aux battery (it is disconnected from the starting battery when the truck is off).  This way you can power your camper or other items using the 7 pin connector(s) without draining your main battery.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Black02Silverado
      Post your UOA, (used oil analysis) here

      By Black02Silverado · Posted

      Here's the second UOA on my 22 Wrangler with the Ecodiesel. This has 5k miles on AMSOIL Signature Series DEO 5w-40. The first one was dealer installed oil, no clue what it was, the second is what AMSOIL recommended, European FS 5w-40, Most of the Ecodiesel world is showing great results using the European MS 5w-40, I figured I would see how the DEO works. This is using an Ecoguard oil filter. It's my understanding this engine likes to shed aluminum.  We will see. So far I don't think this is too bad.    
    • revmanii
      Disable DRL's

      By revmanii · Posted

      I'm surprised nobody seems to offer a solution like the start/stop device I put in my new truck. Remembers my setting when shutdown. And while it still starts up in start/stop, it stores/evaluates what mode it was in when shut down and will change it whithin a second or 2 of startup. It'd be nice to have something like that for the DRLs.
    • btm
      Sunroof Drain Hole Entry & Exit Location (w/ Pictures)

      By btm · Posted

      2015 Sierra 1500 here. Leaks from the sunroof to front driver side and soaks carpet. How do I fix this? Thanks!
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      I will be doing that for sure, but I need to solve who has/ where I can find a bidirectional scan tool that will support OBD 1.5. I'm kicking myself because I ebay'ed a Snap On MT2500 that I didn't think I'd ever need anymore. D'oh!! I'd rather not buy another, so I'll contact a few local shops to see if they have one and how much they'd want to do the procedure. I'd rather have the ability to do it myself... I wish there was a modern tool that could do it all, but I'd have no idea what to buy.   The theory with the pulled timing is that it mimics a rich condition. The delayed spark causes incomplete burn and the O2 sensor picks up low oxygen levels. That's interpreted as a rich condition so the PCM pulls fuel and that shows up in the deeply negative fuel trims.
    • Chuck FB
      Joke Thread

      By Chuck FB · Posted

      An ultra wealthy man had the most beautiful daughter. But, there was a problem. Everything she touched would melt in her hands. No matter what, Metal, Wood, Stone. Anything she touched would melt. She could not feed herself. Because of this, men were afraid of her. Nobody would dare marry her. Her father was despaired. What could he do to help his daughter? He consulted doctors, scientists and anybody who could solve this problem. Finally one of them said, "If your daughter touches one thing that does not melt in her hands, she will be cured." He was overjoyed and came up with a plan. The next day, he held a competition. Any man who could bring his daughter an object that would not melt in her hands would be given billions of dollars to marry her. Three extremely intelligent and handsome young men took up the challenge. The first brought a very heavy steel rod, But alas, when the she touched it, it completely melted in a matter of seconds. He sadly went away. The second brought a beautiful diamond, knowing diamonds were one of the hardest substance in the world and would not melt. But alas, once she held it in her hand, it melted. He too was sent away disappointed. So now, there was one left He was very nervous & sweating. He approached the daughter & said, “put your hand in my pants pocket and feel what is in there." She did exactly what he asked. She felt something very hard. She held it in her hand, squeezing it as hard as she could. It did not melt & remained extremely hard. Her father was overjoyed. Everybody was overjoyed. She was finally cured. Nothing never, ever melted in her hand again. They married and they both lived happily ever after, raising a wonderful family. Question: What was in the the groom’s pants pocket??? Answer below ↓ M&Ms of course! They melt in your mouth, not in your hand. What on earth were you thinking?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...