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  1. 3.6L ESS Aux Battery Bypass

    Somethings seems off, it's not eTorque is it? Instead of N1/N2, try main positive to N1. Post some pics.

  2. 3.6L ESS Aux Battery Bypass

    Maybe not a battery issue. You can try disconnecting the main battery and starting with the aux only. You can also try disconnecting both batteries for awhile to reset the electronics.

  3. ESS Dual Battery Management

    Thanks for your vote, you are obviously very wise. :like: Here's an updated diagram. The trick to this setup is that it's the ground wires that differentiate between the different batteries, both gauges use the same 12v power.

  4. 3.6L ESS Aux Battery Bypass

    If the dealer said it needed a new aux battery, they probably disconnected the old one which would trigger the error light. You can try pulling fuse F42 (and clearing the error code if needed) to get ESS working with just the main battery...

  5. Jumperless Aux Battery Bypass

    While working on another project, I was looking at the fuse descriptions on the underside of the PDC cover and saw this - F42 PCR CTRL FEED (ESS)*. Could it really be this easy? Yes it is. I pulled the fuse, disconnected the aux negative cable from the main battery negative post and it...

  6. ESS jumpstarting, main battery vs N1 terminal

    To facilitate jumpstarting from the main battery with a mini jumper to the N1 terminal, I ordered 2 of these currently out of stock booster pack cables https://www.amazon.com/dp/B08PJPDDFF?psc=1&ref=ppx_yo2ov_dt_b_product_details , then cut and combined red to red and black to black to make 2...

  7. 3.6L ESS Aux Battery Bypass

    The N1 terminal is where power is provided to the system electronics. The N2 terminal connects to the main battery positive terminal, so the N1 to N2 jumper provides power to the system electronics. Thicker wire is always better, but it gets difficult to get the PDC lid over wire thicker than...

  8. 3.6L ESS Aux Battery Bypass

    You have to take your time and make sure you understand how this works and what you are doing. When you ask me do I do this and that, if I'm not clear on your question, I might not answer correctly. For example, I thought you already did the N1 to N2 bypass and now you're asking about when...

  9. 3.6L ESS Aux Battery Bypass

    You made wiring changes by moving the cable from N3 to N4 due to blown N3 fuse and added the bypass jumper to N1 and N2, and now it won't start without an external power source. This tells me your wiring changes worked and the issue is with your main battery because that's the problem that the...

  10. ESS Battery Cable Caution and ESS (N3) Fuse Warning

    As I mentioned in post #12, you should be able to pull the cable of off N3 and move it to N4 to bypass the blown N3 fuse until it gets replaced.

  11. 3.6L ESS Aux Battery Bypass

    I'm pretty sure those lugs won't fit on the N terminals. Post #488 is a better idea. https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/post-1499871 Another benefit of this solution is that if the N3 fuse gets blown (which is not uncommon). you can move the...

  12. Battery Replacement Question for the Experts

    Thanks @Rhinebeck01, but I wouldn't recommend searching all ESS related posts on anyone. :) Start with these newest posts, https://www.jlwranglerforums.com/forum/threads/ess-dual-battery-management.60034/ and...

  13. ESS Battery Cable Caution and ESS (N3) Fuse Warning

    This problem seems to be occurring more often. The JL/JT won't start (hot or cold) and the system electronics are going crazy. Jumpstarting doesn't work and the tow to the dealer results in a new aux battery. A few days later the same thing happens again, won't start, flashing electronics...

  14. ESS Dual Battery Management

    This update fixes more than the bad aux - no start issue on the 2018s, so if you haven't yet, get it done already. It will not affect the amount of boost needed to jump start dead batteries, you're still jump starting 2 batteries.

  15. ESS Dual Battery Management

    The bypass jumper is a temporary fix for when the fuse blows and the aux battery is depleted and cannot power the system electronics. The jumper doesn't replace the 150A fuse, but it allows the main battery to power the system electronics. You should also be able to make a 150A jumper to...

  16. 3.6L ESS Dual Battery Consolidated Information

    https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/

  17. ESS Dual Battery Management

    In what I described, the aux would be getting charged during the jumpstart. My answer was based on the picture that show the bypass jumper installed. Without the jumper, an unflashed 2018 wouldn't start. There isn't any battery switching logic, any attached battery will participate in...

  18. ESS Dual Battery Management

    The only reason I know for the separated batteries configuration is for individual charging of the batteries which some users report doing frequently. It's not intended as a running configuration and as you state, an un-flashed 2018 would not start with a bypass jumper installed. With the 2...

  19. ESS Dual Battery Management

    If you disconnect the aux battery ground cable, the aux battery is isolated and cannot be charged by, or discharge into the system. People do this to charge the batteries separately or, along with the bypass jumper, to run a single battery system. All the battery switch does is disconnect and...

  20. ESS Dual Battery Management

    What you are describing is exactly what Genesis does, move the ESS positive cables to the main battery and disconnect the ESS negative. This is also what's accomplished with the fused bypass jumper. The N1 terminal connects directly to the ESS positive. The N2 terminal connects directly to...


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