3.6L ESS Aux Battery Bypass

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Jebiruph

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In case some of you are not aware, this link is to a thread where I try to answer all the questions and I try to add all the new information to the first two threads. https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.25377/
First, thank you for all of your research in to this and for posting the info. I did go through the above thread previously. My question is, is the below section from the above thread the same thing as the N1-N2 jumper described in the beginning of this thread?

Bypassing the Aux Battery
A bad or discharged aux battery can affect PCR operation, which can be disruptive to system electronics and it may need to be bypassed. Bypassing can be accomplished by using a (fused) jumper wire to connect the main battery directly to the system electronics at PDC terminal N1 or by unplugging the PCR, preventing it from disrupting the system electronics.
 
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First, thank you for all of your research in to this and for posting the info. I did go through the above thread previously. My question is, is the below section from the above thread the same thing as the N1-N2 jumper described in the beginning of this thread?

Bypassing the Aux Battery
A bad or discharged aux battery can affect PCR operation, which can be disruptive to system electronics and it may need to be bypassed. Bypassing can be accomplished by using a (fused) jumper wire to connect the main battery directly to the system electronics at PDC terminal N1 or by unplugging the PCR, preventing it from disrupting the system electronics.

Yes it is. The main battery is connected to directly to N2, so connecting the fused jumper from N2 to N1 or from the main battery positive to N1 is the same.
 

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Yes it is. The main battery is connected to directly to N2, so connecting the fused jumper from N2 to N1 or from the main battery positive to N1 is the same.
Thanks!
 

Midwestguy

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Odd request, but can someone tell me what size (thread?) the wingnuts are to secure the terminals to the N1/N2 posts? Im making up a kit for a few jeeps as backups for this winter....
 

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Odd request, but can someone tell me what size (thread?) the wingnuts are to secure the terminals to the N1/N2 posts? Im making up a kit for a few jeeps as backups for this winter....
I recently asked the same question over on the thread about nuts and bolts sizes. No response yet.

Also would a wing nut have the room between posts to be spun between posts?

I was also thinking about small clamps for the jumper I’m going to make.
 

Midwestguy

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I recently asked the same question over on the thread about nuts and bolts sizes. No response yet.

Also would a wing nut have the room between posts to be spun between posts?

I was also thinking about small clamps for the jumper I’m going to make.
 

Midwestguy

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I do know that a wingnut thats close in size/thread works as I tried it out with one thats close and theres enough clearance
 
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I recently asked the same question over on the thread about nuts and bolts sizes. No response yet.

Also would a wing nut have the room between posts to be spun between posts?

I was also thinking about small clamps for the jumper I’m going to make.
N1, N2 and main baterry negative are M6x1.0
Aux battery negative is M8x1.25

Some have bought wingnuts that were too wide. All the ones I bought fit between the post, but you may have to back the first one off a little until the second one is on.
 

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I created two auxillary bypass fused jumpers today (similar to jumper in first post). I used a crimping tool (link below) to install a ring terminal connector on each end. the connection feels pretty solid.

question: should I also use a soldering iron to apply solder to the ring connector/wire end? normally I would just do this without thinking about it but thought I'd check here first, thanks!

crimping tool:
https://www.amazon.com/gp/product/B0069TRKJ0/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
 

GRAK

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So uh I've got the little wire with the fuse on it in the glovebox just in case... say it won't start out in the middle of nowhere... I just loop it over posts 1 & 2, no special order, no disconnecting anything first, won't zap myself dead? Just confirming :LOL:
 

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So wait, after playing around with this I've learned that the batteries are in parallel when the engine is off. You can disconnect the Aux battery simply by removing the negative terminal, and the Jeep still starts but gives you an ESS error. So why would anyone install the jumper to jump start rather than just disconnect the AUX?
 

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I have looped N1 and N2 with a fused jumper and then removed the ESS negative off the main and my JL has started and ran fine with no error messages, I left it that way for just over a week and all was good, was going to leave it permanent but it’s under warranty so I just carry the jumper
 

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When you say ESS negative, are you referring to the Aux Battery negative ?
 

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When you say ESS negative, are you referring to the Aux Battery negative ?
When I say ESS negative I am referring to the ESS negative that is connected to the main battery negative.
 

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