mazeppa
Well-Known Member
- First Name
- y= x/0
- Joined
- Feb 11, 2018
- Threads
- 20
- Messages
- 877
- Reaction score
- 1,456
- Location
- ICBM complex at Kodlosk
- Vehicle(s)
- 2021 JTR Panda
- Occupation
- knife sharpening snob
JT/JL/JLU is a whole different animal... What you know in regard to your lifelong vehicle battery related experiences, will only serve to help you try to get a handle on.. to try to understand the dual battery system, 12v battery related issues, etc. in regard to a JT/JL/JL.
Talk from about how the battery behaved in my VW, JK, Chevy, and is almost laughable. YES, there is such a major difference in comparison to your JT/JL/JLU.
Spend a few hours reading, researching at the JL Wrangler forum.. JL/JLU owner's have been doing this dance so to speak, for 3 years. You could read there for hours and still not get a grasp on this battery ... dual battery thing.
In my opinion the two different size/type of batteries always hooked up in parallel (except during a Start Stop Event) is detrimental to long term battery life. So I keep the ESS turned off with a forum sponsor SmartStopStart memory module and the and basically the aux battery ground disconnected, I independently charge the aux battery occasionally to extend its life. I may later just remove the aux battery because my lawn mower needs a replacement battery this spring, may as well put it to good use (yes, I know I have wacky ideas.)
This image of the Jeep JT/JL dual battery schematic by @jebiruph
The PCR relay only opens the NC contacts during a Start Stop Event and both batteries at that moment are not hooked up in parallel, each battery then powers independent circuits in the Jeep.
See Jebiruph threads on the JL Wrangler Forum as I think Pepe was referring to.
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.25377/
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