YJ dual battery set ups - JeepForum.com
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post #1 of 27 Old 04-25-2007, 11:50 AM Thread Starter
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YJ dual battery set ups

Who is running a dual battery, and how do you have them wired. I'm thinking with all of the lights, stereo, amp, winch, etc it may be a good idea to run two instead of one .

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post #2 of 27 Old 04-25-2007, 11:57 AM
92 Green YJ
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I haven't gotten to doing it on my YJ yet, but when I go dual batteries, I plan to use the kit from here
http://www.12voltguy.com/catalog.0.html9.0.html

92 YJ. High Output 4.0L
Rubicon Express 4" Lift Kit, 2" Body Lift,15x8" AR 767s, 35x12.50 Xterrains, Home Made Snorkel, Sanden OBA, Home made rocker gaurds. 8.8 Rear with Discs, 4.10s F&R, ARB rear, Detroit EZ Locker front, WarnM8000 with Viking Synthetic Line, Beadlocks, Tons of Mods
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post #3 of 27 Old 04-25-2007, 12:04 PM Thread Starter
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that looks like a great set up, thanks. I have 2 red top Optimas, but I not sure if it's really needed to run both of them. My thinking is it can't hurt.
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post #4 of 27 Old 04-25-2007, 12:49 PM
92 Green YJ
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yeah i really like 12voltguys stuff, I run his in cab winch controller currently and plan to order more stuff from him when I enter the next phase of my YJ project, hes a great guy to work with and his products are top notch.

I also agree it can't hurt to run dual batts. I have alot of AUX electronics in my YJ, plus the winch, and it would also be nice to have dual batteries readily available if i have to do a battery welder. (yes I have done it several times, sucks having to pull batteries from other peoples rigs to wire it all up)

92 YJ. High Output 4.0L
Rubicon Express 4" Lift Kit, 2" Body Lift,15x8" AR 767s, 35x12.50 Xterrains, Home Made Snorkel, Sanden OBA, Home made rocker gaurds. 8.8 Rear with Discs, 4.10s F&R, ARB rear, Detroit EZ Locker front, WarnM8000 with Viking Synthetic Line, Beadlocks, Tons of Mods
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post #5 of 27 Old 04-25-2007, 12:52 PM
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Quote:
Originally Posted by 92 Green YJ
I haven't gotten to doing it on my YJ yet, but when I go dual batteries, I plan to use the kit from here
http://www.12voltguy.com/catalog.0.html9.0.html
THANK YOU!

I have been trying to find a cheaper replacement solenoid for my dual battery setup since mine died. All the ones I found were like $80+ and theirs is only $37.

Sold 90' YJ, 4.2, Weber, 4" Procrap, 33" BFG MTs, 8.8 w/ 4.10s & LSD, SYE & Tomwoods DS, Dual Optimas, Jacobs, Electric fan.

97' ZJ, SOLD
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post #6 of 27 Old 04-25-2007, 01:28 PM
jeepster93
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I have a dual battery setup.
2 Optima red tops
Tomkin dual battery holder
Hellroaring BIC controller.
This setup isn't really a 2 battery system as much as a battery backup system. They are different. I keep my 2nd (backup) battery always charged and not in use. The main battery is used for everything..starting, lights runnini, etc.
However.
The hellroaring bic(battery isolator/combiner) allows the driver, through a dashboard switch, to combine the 2 batteries for..whatever..needing HIGH amps, like a dead battery, or a long winching that would damage a single red top(remembering the red top is not a deep cycle).

Last edited by jeepster93; 04-25-2007 at 02:16 PM.
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post #7 of 27 Old 04-25-2007, 01:46 PM
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I think an upgraded alt is the best first step to upgrading your electrical system, especially for winch work. That is if you haven't yet. It's alot cheaper too, depending on what alt you pick-up.

-Scott

'94 YJ on 35s


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post #8 of 27 Old 04-25-2007, 06:37 PM
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i know lots of people running dual batteries... a few of the ones that started with isolators don't run them anymore b/c they have failed and they saw no need to replace them.....

none of them report any problems running without the isolator..... 2 of them have been this way for 4+ years....

-Erik <-- will put the isolator money towards gas when i go dual batteries

'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

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post #9 of 27 Old 04-25-2007, 06:52 PM
kenny kustom
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Heres mine. No isolator. Batteries wired together. my alternator also puts out about 120A at idle now with 194A max.

1989 yj. AMC 360, Cj front clip and custom interior/dash. Herculiner inside and out, Dana 60's, 5.38's, ARB's. 40" iroks.

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post #10 of 27 Old 04-25-2007, 07:24 PM Thread Starter
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Great info guys Thanks! Since I have the batteries I think I'm going to do it. I'm just undecided on the isolator part of it. I'm just concerned without it I may fry something under the hood. I still have the stock highoutput alt.
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post #11 of 27 Old 04-25-2007, 08:43 PM
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Hellroaring Technologies

Best isolator setup out there

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post #12 of 27 Old 04-25-2007, 08:55 PM
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Homemade tray, dual 34/78 series redtops:



Dual Battery Setup Writeup, also links to my Dodge Alternator swap writeup.

Personally I don't have an isolator because it limits the power you can actually get between the two, notice most isolators only are capable of carrying 200-300 amps, how many cold cranking amps is your battery rated? They just burn out. Nearly every large truck you see on the road today has dual batteries with them just tied together, same with most motorhomes.

Save the cash and tie them together.

Use that cash to buy a battery tray. I thought building the tray would be easy, but their are 11 different mount points to the factory tray, did you know that? Putting all 11 mount points back in was no fun, but I wanted it to be well supported. I know I made the mistake on my tray of making it exactly fit a 34/78 series Optima, just a heads up that a 34 series Optima is not the same size as a standard 34 series battery, so now I'm stuck buying Optimas, replacing them with a standard battery is not an option. Keep this in mind if you build one, give yourself some options.

95 YJ: SOA, locked 44, locked 8.8, 37s, beadlocks, OBA, winch, and a few other things.
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post #13 of 27 Old 04-26-2007, 02:52 PM
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I built mine from angle iron. Took me about 2 hours and looks good. No pics sorry

motor spins over like crazy now. -30 deg and cranks like a pro.

I dream of the jeep, drive the chevy and roush pays for it all
1990 YJ lerado,Soa,2.5R.E.springs,8.8,4.88'sPSC trail cage&rocker nockers w/sliderbars,home made bumpers, 35"boggers,sye, tomwoodsds, revolvers, red & yellow optima, bushwackers,corbeua ss seats,mc2100,juicebox, 3core rad., b&mshifter and highlift,5point harnesses,wheel spacers,9000lb mile marker,ssdash kit,no sway bar, no trackbar, walmart lights,clinometer, XJ passenger shaft, axle tube seals, M.O.R.E track bar

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post #14 of 27 Old 02-16-2009, 07:56 PM
ghiradelli777
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bump..........sounds like a good plan!!

1992 YJ Sport White 4.3 swap in progress
Eagle Scout Jeep Owner
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post #15 of 27 Old 02-17-2009, 01:53 AM
jsawduste
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X whatever on simply connecting positive to positive/negative to negative. No isolater.
Twin yellow tops and ZERO problems

180 amp tickeler and 2/0 (welding cable) cables.
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