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Adding a Dual Battery

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RACERX7775 Enthusiast

RACERX7775

Posted
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But since i have a charge wire connecting batt1 and batt2, they should both see the same voltage. Right? So in theory, if I was pulling alot of power for the stereo, batt2 to the amps, the charge cable connected to batt1 and batt2 should equal out voltages between the 2 batts., then the alt would sense the lower voltage, and adjust charging amperage. 

 

If i did not have a cable from batt1 to batt2, then i would agree with you because then the alt really wouldnt know how to charge batt2.  It would really only charge accordingly to what batt1 would require. 

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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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Nasty Senior Enthusiast

Nasty

Posted
Posted
1 minute ago, RACERX7775 said:

But since i have a charge wire connecting batt1 and batt2, they should both see the same voltage. Right? So in theory, if I was pulling alot of power for the stereo, batt2 to the amps, the charge cable connected to batt1 and batt2 should equal out voltages between the 2 batts., then the alt would sense the lower voltage, and adjust charging amperage. 

 

If i did not have a cable from batt1 to batt2, then i would agree with you because then the alt really wouldnt know how to charge batt2.  It would really only charge accordingly to what batt1 would require. 

The sensor on the ground is what regulates it. Maybe im just not understanding how you have it but i know ive fought with that issie a bit a few years ago

RACERX7775 Enthusiast

RACERX7775

Posted
Posted (edited)

Let me see if i can draw a diagram and ill post it back in a few. Maybe i can rewire it for the better..Im always up for some learning.?

Edited by RACERX7775
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RACERX7775 Enthusiast

RACERX7775

Posted
Posted (edited)

Both batteries are factory Delco batteries I bought at the dealer.  My original 2014 battery died a month before I started touching the truck. Thats why I bought the second Delco battery to match. They have a great warranty. And I wasnt spending the money for a XS or Oddessy batteries.  I wanted factory fit and matching batteries. I  know this might not be what others like or would do, but it works for me.

20181124_132130.jpg

 

Screenshot_20181124-134731_Gallery.jpg

Edited by RACERX7775
RACERX7775 Enthusiast

RACERX7775

Posted
Posted (edited)

Correct. Completely.  And i just zoomed in. The stud where i connected to is fused at 125 amps. Not 175... but the second battery will never draw that much.

Edited by RACERX7775
Nasty Senior Enthusiast

Nasty

Posted
Posted
2 minutes ago, RACERX7775 said:

Correct. Completely.  And i just zoomed in. The stud where i connected to is fused at 125 amps. Not 175... but the second battery will never draw that much.

Ido see issues in your future from what i dealt with.  Your sensor is on the battery that thr alt isnt hooked up to   but if it works for now. Just run it until you have an issue.   This was when i had single alt in my 07c. 

20181124_104655.jpg

RACERX7775 Enthusiast

RACERX7775

Posted
Posted

Nice install. Yeah. Im pretty sure the alt wont last forever. One of these days, itll be all redone under there. But thats after the factory alt takes a crap.

Nasty Senior Enthusiast

Nasty

Posted
Posted
1 minute ago, RACERX7775 said:

Nice install. Yeah. Im pretty sure the alt wont last forever. One of these days, itll be all redone under there. But thats after the factory alt takes a crap.

1 think i would change is the curcuit breakers. Those wear out.  

RACERX7775 Enthusiast

RACERX7775

Posted
Posted

Eh. Debatable. Have them in my excursion since 2008.  I just like with a push of a button, i can shut power off.

1SLOW1500 Senior Enthusiast

1SLOW1500

Posted
Posted
Both batteries are factory Delco batteries I bought at the dealer.  My original 2014 battery died a month before I started touching the truck. Thats why I bought the second Delco battery to match. They have a great warranty. And I wasnt spending the money for a XS or Oddessy batteries.  I wanted factory fit and matching batteries. I  know this might not be what others like or would do, but it works for me.
20181124_132130.thumb.jpg.3bfa120ae13190ad8df2f14c6a080c3f.jpg
 
Screenshot_20181124-134731_Gallery.thumb.jpg.27d812e09df1c8bb6d4029a3101a8951.jpg
Only thing I would change with that wireing is get rid of the wire between batteries and just let the alternator charge both. One would assume all the aftermarket higher amp goodies are hooked up to batt2 anyways. And voltage flows in all directions at once. But I also assumed you miss drew the diagram and have the stock alt to batt1 wire still there. So the wire across the engine bay isn't needed.
I'm not as worried about the alternator as I am the batteries. Fast is if one goes weak it will shorten up the life of the other and the alt as well. But same as mine.

Nice taste in batteries Nasty.

Sent from my SM-N950U using Tapatalk

RACERX7775 Enthusiast

RACERX7775

Posted
Posted
16 minutes ago, 1SLOW1500 said:

But I also assumed you miss drew the diagram and have the stock alt to batt1 wire still there. So the wire across the engine bay isn't needed.

 

Hmmm. I do have the factory wire from alt to batt1.

Nasty Senior Enthusiast

Nasty

Posted
Posted
30 minutes ago, RACERX7775 said:

Hmmm. I do have the factory wire from alt to batt1.

Yes have the alt charge the oem battery where the sensor is 

 

50 minutes ago, 1SLOW1500 said:

Only thing I would change with that wireing is get rid of the wire between batteries and just let the alternator charge both. One would assume all the aftermarket higher amp goodies are hooked up to batt2 anyways. And voltage flows in all directions at once. But I also assumed you miss drew the diagram and have the stock alt to batt1 wire still there. So the wire across the engine bay isn't needed.
I'm not as worried about the alternator as I am the batteries. Fast is if one goes weak it will shorten up the life of the other and the alt as well. But same as mine.

Nice taste in batteries Nasty.

Sent from my SM-N950U using Tapatalk
 

Its all ive ever used. I used to compete in audio. Those batteries take a beating. That truck still has the original xs battery i put in it when i got it almlst 7 years ago. They tske a beating and last forever. Even longer if you get thr xs charger and do the maintenance charge every so often. Ues theyre a little expensive but they last way longer 

RACERX7775 Enthusiast

RACERX7775

Posted
Posted

What about adding another ground sensor for batt2 and wire that one into the factory sensor... they only cost like $25.

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