battery

  1. Disconnecting Battery/s to Install LED Headlamps?

    I am about to swap out my factory halogen headlamps and fog lamps with the Mopar/OEM LED's. My Wrangler is a '21 with the 4th wire, so no need to run the additional supplied harness or fuss with the fuse box, BCM, etc. They are supposedly (really) plug n' play, then a quick trip to the dealer...
  2. Voswitch killed battery I think

    So on saturday I installed a Voswitch jl200, now I am not very good with electrical stuff like that , but I installed it exactly how the instructions said and how videos showed. On Sunday I was driving and the ESS system wasn’t kicking in, I woke up today for work and the Jeep wouldn’t start or...
  3. Mapping the Battery Cables

    I am trying to isolate my Aux battery so that I can separately charge it to determine if it needs replacement. I do not know which cable is which and could not find the info in the forums. Can anyone identify the six cables? Thanks.
  4. SOLVED - No volts on interior battery wire (aux switch bank)

    Resolved- fuse F72 goes to that wire. Fuse box specifies 30 amp fuse and there was a 10 amp fuse there instead. replaced with a spare 25 amp and everything is working now! Does anyone know why I may have no volts on the red/white wire under the passenger side dash? It worked a couple months...
  5. 100% Battery Range

    Hey all, I have been pleasantly surprised with the amount of range I've had in EV mode. I've had total range estimates that far exceed the EPA 21 Mile estimate. I've seen 25, 28, 30, and this morning I saw 32 miles at 100% charge. Pretty incredible! Does anybody know if it calculates range...
  6. My ESS has more excuses than my 8 year old

    The system previously threw warnings to service the ESS. Taken to the dealer under warranty and they did a software update. It no longer tells me to service the system but has not worked once since the update. It seems it has a full list of excuses of why it is not working instead. I really...
  7. Tazer JL & Mopar AUX Switch/ESS Issue

    Hey everyone, I have a rather strange issue that I have not seen elsewhere on the forum that I am hoping someone can help with. I just installed the Mopar AUX switch kit in my 2019 JLU and I used the Tazer JL (version 11.1.5) to enable the switches in the Uconnect menu. Double checked my work...
  8. "Aux switches temporarily unavailable while battery charging"

    I went to start up my 2018 JLU Sport S the other day and got a message on the dash that said "Aux switches temporarily unavailable while battery charging". I only have 2 things connected to my Aux switches and neither were on, so I thought it was weird. I flipped through the vehicle info pages...
  9. Charging Issues

    My 2020 wrangler unlimited rubicon started giving me a warning today concerning the charging system. The icons on the dashes were a red battery on the left and start/stop malfunction on the right. I realize that the start/stop system will not work if the battery is low. The voltage started off...
  10. 3.6L ESS Bad Aux Battery No Start Firmware Fix

    When my 2018 JLU was at the dealers for the steering stabilizer recall, I asked about updating the radio firmware to fix some issues I was having (5" radio). They updated the PCM, ABS and radio firmware. Yesterday I noticed the low speed surging was gone, so today I tested starting with aux...
  11. Is a supplemental/ESS/aux battery jumpstart dangerous?

    A few days ago a picture was posted on another thread (https://www.jlwranglerforums.com/forum/threads/quirks-not-addressed-in-user-guide.40684/page-6#post-922367) that showed a jump start related addendum to the owners manual that states "Only use the positive battery post on the main battery...
  12. Check your nuts - battery terminal nuts, that is

    I just got a new '19 JLUR at the beginning of September, and installed a winch a couple weeks ago. While I was installing the winch, I was surprised at how easy it was to loosen the negative battery terminal auxiliary post nut. So I checked them all the nuts on the battery connections. None of...
  13. ESS Battery Underhood and Management Diagram

    This new diagram is based on the appearance and location of the different components under the hood. I'm open to suggestions that would help with the readability/usability. For those that aren't aware, there are several 3.6L ESS threads in the 3.6L Engine forum if you're looking for more ESS...
  14. 2-month old JL Rubicon battery died, service dept. says it’s normal

    When I asked my dealership’s service department guy why my JL’s battery was completely dead after not driving it for just 2 days, he says “it happens, these new cars have more technology and electronics.” Me: “So was it a weak/bad battery from the factory?” Him: “No, there’s no such thing as a...
  15. Leaving for 10 days, battery issues?

    I did a quick search and found some dead battery threads, but nothing relating to what my situation will be. I am leaving for 10 days and the JL will be parked untouched the entire time. I’m the past with my WRX with aftermarket remote start, the battery would be dead after 4 days. Has anyone...
  16. 3.6L ESS Dual Battery Consolidated Information

    Due to the quantity and length of ESS battery and electrical related threads, researching issues can be time consuming and confusing. I am using this post to make information and related links easily available. This first post will serve as a quick reference and I'll use the second post to...
  17. 3.6L ESS IBS Information

    I thought I'd start this thread for discussing the operation of the IBS. First is a link to the technical description of the IBS from Bosch. The rest of the post is my interpretations and observations...
  18. 3.6L ESS Battery Basic Load Testing

    Checking the voltage of the batteries is a good start, but a battery with good voltage can still fail when under a load. To really test the batteries, you need a load tester. Some auto parts stores will load test your battery for you, but having dual batteries complicates the testing. To do my...
  19. 3.6L ESS Battery Diagram

    Here's my attempt at a diagram that illustrates the battery connections for the 3.6L ESS dual batteries. Hopefully this will help make sense of why things work the way they do. I tried to show that when you pull the battery terminals off of the battery, there is still an electrical connection...
  20. ESS Not Working- Blown fuse blocks and battery sensor due to winch

    To make things short and sweet I've been doing a decent amount of wheeling with my JL, no issues until about 2 months ago. While wheeling with a couple jeeps and two F250 super duties I had to use my winch for the first time. One truck got stuck, pulled him out, 2 minutes later the same truck...
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