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Thread: JL JOURNAL : HOW TO Replace Main & Auxiliary Battery on a JL Wrangler / JT Gladiator

  1. #21
    Administrator wayoflife's Avatar
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    Quote Originally Posted by Danny View Post
    Is it probable these 2018 batteries might had been sitting for some time before the JL was sent out? Lead acid batteries hold an expiration date before chemical process is deemed unable to hold a charge. If the acid is inactive, the lead is sulfated, or the plate contact is broken inside the cells it wonít charge. I was surprised about the plugs on the bottom of the fuse box.
    Who could say for sure but I suppose it is possible.

    Quote Originally Posted by Rampart22 View Post
    Hey Eddie and Cindy,
    Great video btw. Why Odessy batteries? Iím a bit shell shocked at the prices for a replacement. Is it really worth it? Yeah I know. Itís a Jeep... thatís what we do. But still thats another $300 plus. And apparently Iíll need a new one to avoid this happening again. Yeah again.

    Also, any luck with dealership on a battery replacement?

    I just had my Jeep towed to my mechanic for what ended up being a dead battery. They charged it overnight and now seems to run without issue. Even took it to the dealership. They re flashed the computer with an update that actually added a few minor new features on the screen. Dealership said it was an update issue that the computer was going weird prior to battery dying. Iím still scratching my head on that one. So no new battery from dealership for me. But at least I asked right

    Also that type S charger looks like a must for me as well. Any issues with it?

    Cheers
    I've had the Type S jump starter for over a year now and have used it a few times. No problems what so ever. I would highly recommend it.

    Regarding batteries, you can find replacement batteries at O'Reilly, Autozone, Napa and the dealership and for less than an Odyssey. I prefer Odyssey because they're a good deep cycle battery and that's good to have for winching and if you run things like a fridge.

  2. #22
    Nothing but a Thing
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    Hmm maybe because your JK doesn't have stop start. If you had only one battery in your JL and stop start was going all the time you'll fry your computers in a couple years tops. Every time your jeep cranks there is a voltage dip. Then a spike when the cranking stops. No big deal on a vehicle that you start a couple times a day. Huge deal on a vehicle that can start dozens of times in an hour.

    The two batteries disconnect during cranking. All the computers are on the small aux battery and then the big battery cranks the engine. Once it's up and running the batteries reconnect. That keeps the computers from seeing all the dips and spikes. Pretty simple to understand why it is the way it is when you know how it works.

    Quote Originally Posted by KSCRUDE View Post
    What a total piece of shit Whap and Jew has engineered there. Total unneeded dog shit. My Jk only needs one battery, why does this dog turd need two? If they want to use two batteries, put them both up top like a diesel pickup. Like God intended. Oh well I donít think my new Bronco will have a fucking abortion setup like this. In your driveway at 5 am in the fucking dark with -50 windchill blowing up your ass, that would be no fun!
    Sent from my SM-G960U using JL Wrangler Jeep Forum mobile app

  3. #23
    Hooked Danny's Avatar
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    So what with the 2.0L. It is possible the 48v battery is the main power to the generator since there is no alternator. The 12v battery is only used at start up?


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  4. #24
    Nothing but a Thing
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    The entire vehicle still runs on 12V. The 48v battery is the interface to the generator and then there is a 48v to 12v converter that charges the 12v battery from the 48v battery.
    Quote Originally Posted by Danny View Post
    So what with the 2.0L. It is possible the 48v battery is the main power to the generator since there is no alternator. The 12v battery is only used at start up?


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app
    Sent from my SM-G960U using JL Wrangler Jeep Forum mobile app

  5. #25
    Resident Smartass OverlanderJL's Avatar
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    Just getting caught up over here. Been a while.

    That looks like a pain in the ass!


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