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  1. 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...
  2. 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...
  3. 3.6L ESS Cold Start

    (Disclaimer: Theories regarding the 3.6L ESS starting process are educated guesses, here's mine.) After months of people suggesting that the PCR separates the batteries before a cold start, I finally tested this several weeks ago. I found that the PCR is activated for a very brief instant...
  4. ESS Not Ready, Steep Grade on flat ground, pitch 6°

    Need help; When I was driving my Wrangler today I noticed that ESS wasn't working as usual, so I went into menus to check ESS message and it says due to steep grade, so I went to check Pitch & Roll and it was showing 6° on level ground. I was on my way to work so I dropped it off at the nearest...
  5. 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...
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