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Old 03-04-2021, 08:18 PM
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NEED HELP ~ Dual battery mount on firewall?

Has anyone mounted both batteries off the firewall where the heater box and fan were? I've been googling my arse off and haven't been able to find a mount that bolts to the firewall, even more so one that will not have issues with the Cummins 5.9l turbo set up.

I'd appreciate all of the help I can get. TIA
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Old 03-04-2021, 08:54 PM
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Might look at some of the older CJ set ups. I know some people mounted two vertically back there. You could get one there and one in the stock location if it hasn't gone with the 5.9.
Probably going to have to fabricate something out of thin air in the end.
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Last edited by goldhammer : 03-04-2021 at 10:30 PM.
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  #3  
Old 03-04-2021, 09:48 PM
ZacharyH ZacharyH is offline
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You can cut the inside of the fender and fit 2 batteries.
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Old 03-04-2021, 10:42 PM
SJTD SJTD is offline
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I did the above but one on each fender. Several years ago. Sometimes I wonder why I didn't put them on the firewall as you propose, I don't think I even considered it at the time.
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Old 03-05-2021, 10:29 AM
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Quote:
Originally Posted by goldhammer
Might look at some of the older CJ set ups. I know some people mounted two vertically back there. You could get one there and one in the stock location if it hasn't gone with the 5.9.
Probably going to have to fabricate something out of thin air in the end.

Agreed.
I rolled my own? I believe 2 would fit in that spot.

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  #6  
Old 03-06-2021, 02:38 AM
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Heep-J4000 Heep-J4000 is offline
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There are duall battery trays for the jeep cj's available.
So you could make something like that for your truck!


May I ask what kind of radiator you run with the Cummins in your jeep?
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  #7  
Old 03-07-2021, 08:45 PM
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Quote:
Originally Posted by goldhammer
Might look at some of the older CJ set ups. I know some people mounted two vertically back there.

Those are showing up a lot in my search, but none that will either fit or will mount to the firewall.


Quote:
Originally Posted by goldhammer
You could get one there and one in the stock location if it hasn't gone with the 5.9.

That would have been the easiest route, only needing to install a firewall mount where the heater box & squirrel cage was buuuut thats where the PO hacked the fenderwell to put the OEM Dodge filter housing.


Quote:
Originally Posted by goldhammer
Probably going to have to fabricate something out of thin air in the end.

That may end up being the case, but I'd end up having to give up a kidney to pay a shop to fab one to fit.
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  #8  
Old 03-07-2021, 08:48 PM
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Quote:
Originally Posted by ZacharyH
You can cut the inside of the fender and fit 2 batteries.

The PO hacked the inner fenderwell to put the one battery at the firewall and the Dodge OEM filter housing where your pic shows the batteries.

How do you get your pics to post? I no longer have a photo bucket and don't want to pay to host pics.
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  #9  
Old 03-07-2021, 08:58 PM
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Quote:
Originally Posted by SJTD
I did the above but one on each fender. Several years ago. Sometimes I wonder why I didn't put them on the firewall as you propose, I don't think I even considered it at the time.

If I mount one on each side there are a plethora of options to mount the passenger side, width wise. There is just enough room to get a battery in between the brake booster and the hood springs, but I can't find a mount that positions the battery lengthwise from the firewall.
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  #10  
Old 03-07-2021, 09:05 PM
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Quote:
Originally Posted by goldhammer
Might look at some of the older CJ set ups.

. . . . .

Quote:
Originally Posted by babywag
Agreed.
I rolled my own? I believe 2 would fit in that spot.



The measurements bear out that two batteries will fit mounted length wise on the firewall, but a heat shield would be necessary because of the location of the turbo.

If I had the skills and tools or the wallet to pay a shop I would have posted it up as a tech type article so the next person has another option to choose from. It sure has me missing all of the resources I had in CA.
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  #11  
Old 03-08-2021, 08:31 AM
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If you can find a local welding shop they are usually pretty reasonable for projects.
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Old 03-08-2021, 05:16 PM
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scout4bta scout4bta is offline
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Have you considered using only 1 Battery?
I've used a single group 31 BlueTop Optima battery on all my first gen Dodge's with 5.9L Cummins and not had any start problems.
The group 31 has 900 CCA.
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  #13  
Old 03-08-2021, 06:35 PM
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Tigger-. Looks like I'm about 45 miles north of you. If you can scrounge up the materials and provide accurate measurements, I'm willing to fab up what you need.
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  #14  
Old 03-09-2021, 02:18 PM
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Quote:
Originally Posted by scout4bta
Have you considered using only 1 Battery?
I've used a single group 31 BlueTop Optima battery on all my first gen Dodge's with 5.9L Cummins and not had any start problems.
The group 31 has 900 CCA.

It has one battery in it now, courtesy of the PO, and it would start it decent weather but would take its own sweet time. They're supposed to have a 2 battery set up. If I was still in AridZona like you I would probably get by OK with one that has the higher cranking amps, but here in the PNWet of Oregon it does not like one battery, especially in the cold.
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Keep in mind. Getting old is easy. Being old is hard.
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  #15  
Old 03-09-2021, 02:21 PM
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Quote:
Originally Posted by babywag
If you can find a local welding shop they are usually pretty reasonable for projects.

I've had two occasions where I had to utilize a shop and they aren't as affordable as back home in SoCal. This would take more fabrication and I'd have to tow the truck to the shop for them to guarantee the fitment. If I don't and the measurements were off for any reason it falls on me. Funds are even tighter having been dealing with a work injury or I might pursue it just to get it done.
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  #16  
Old 03-09-2021, 02:33 PM
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Quote:
Originally Posted by goldhammer
Tigger-. Looks like I'm about 45 miles north of you. If you can scrounge up the materials and provide accurate measurements, I'm willing to fab up what you need.

A wee bit o' babble ... Ive got rough dimensions so far. I also have 2 new batteries on hand, one Group 34 and one 34/78. I doubt it matters ... the OEM battery is a Group 27, but it seemed too tall and I didn't want to risk potential contact issues with the hood. The 34 and 34/78 have the same CA/CCA ratings so I went with them. Part of me was contemplating pair of Optima, but the initial cost was a bit of sticker shock. Have you ever run them up here? Are they worth the extra $$$?

I drew up some rough sketches, but don't have a way to post them here so you can see them. They're at least worth a laugh or two. Maybe buying a pre-fabbed firewall mount and making one for the driver side? Or do think it would be easier/cheaper to do the double mount for the passenger side? (That one will need a heat shield)
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Keep in mind. Getting old is easy. Being old is hard.
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Old 03-09-2021, 02:50 PM
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Have never run optimas.
As to cost, no idea on what the prefab unit is, where it mounts or if enough room to mirror it to fit the left side since the booster and master is over there. Or if the prefab can be modified and added to, and made to secure both batteries. Depending on space left, a heat shield shouldn't be too hard.
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88 XJ, 3" lift, 31-10.50's, custom bumpers and winch/tow bar mounts, Warn 9500HS, custom sliders/steps, camo paint, & headliner

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  #18  
Old 03-09-2021, 04:33 PM
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Personally, Optimas, etc.(had one) if you compare $$ for years of service, I don't think it really pays off vs. the Everstart Max or Exide Extreme. I been using those in my cars without any failures, best bang for your buck. I live on the east side of the Cascades at 4200' basically 5-6 months of cold, snow, freezing winters. I guess if you can afford them, go for it.
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Old 03-10-2021, 12:37 PM
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Quote:
Originally Posted by oregonphil
Personally, Optimas, etc.(had one) if you compare $$ for years of service, I don't think it really pays off vs. the Everstart Max or Exide Extreme. I been using those in my cars without any failures, best bang for your buck. I live on the east side of the Cascades at 4200' basically 5-6 months of cold, snow, freezing winters. I guess if you can afford them, go for it.

Hey Phil 👋 I couldn't find enough data to support the cost of Optimas either. I bought a pair of Super Start Premiums from O'Reilly. We don't get the snow or as intense cold winters like you do here in the valley so I figured I'd roll the dice and pray I get 4 years out of em at least. Originally they were $150 each, but their low price guarantee dropped them to just under $120 each to beat out Wally World.
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Old 03-10-2021, 01:10 PM
ZacharyH ZacharyH is offline
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