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3.6L Alternator/Battery Charging

WranglerMan

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I’m sorry to hear it’s the headunit that has problems and hope it gets replaced soon but glad you got it resolved at least.
 

Soli

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This has been discussed a lot. At a minimum, please read this thread: https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.25377/

Some vehemently argue that 14+ reading means you have a failing battery or batteries. Others, like me, say it’s normal. Mine has read 14+ since day one of ownership. I’m at nearly 36,000 miles and 2.5 years of ownership. I put my batteries on a tender several times a month. I have never had an ESS error or a dead battery.

By the way, my 2016 GMC Yukon XL with a one week old battery also reads 14+ volts regardless of how long a road trip we take; it always has.

Grab a $50 Deltran battery tender and keep your batteries well maintained. No harm in having your batteries tested in isolation, if you’re worried.
I have just replaced my aux and main battery with odyssey batteries. My old battery would always read 14.5 when driving or coasting to a stop…after installing the new batteries i now see 13.5 when driving and then it goes up to 14.4 when coasting..seems like its a main battery dying? Please anyone correct me if im wrong
 

OldGuyNewJeep

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I have just replaced my aux and main battery with odyssey batteries. My old battery would always read 14.5 when driving or coasting to a stop…after installing the new batteries i now see 13.5 when driving and then it goes up to 14.4 when coasting..seems like its a main battery dying? Please anyone correct me if im wrong
Eek. Don’t follow what I wrote there way back when… I was dead wrong. (And your observation is correct.)

Here’s a better place to start reading (especially the links I posted in there): https://www.jlwranglerforums.com/forum/threads/noco-warranty.120359/
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