- First Name
- Andy
- Joined
- Nov 19, 2019
- Threads
- 59
- Messages
- 1,658
- Reaction score
- 1,264
- Location
- SanFrancisco
- Vehicle(s)
- JL Wrangler
- Banned
- #46
Thank you Bobby. I did not know that FCA changed the logic for start of the 2019's and beyond. I'd like to think the letter I sent to the President of FCA on why the 2018 design was stupid, and how to so easily correct it with a simple start up logic change had an effect but I doubt it.Except, what I learned from another thread is that the Jeep JL (at least 2019s and 2020s, it appears) WILL start from the main battery if you disconnect the aux battery. So, in the case of a bad aux battery, disconnect the negative aux battery lead and jump the main battery as normal with a jumper pack.
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/page-20
I think that logic change should also happen in the 2018!
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