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Thread: JK completely dead. Can't jump it. Zero power.

  1. #1
    Fresh Catch supercell's Avatar
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    Question JK completely dead. Can't jump it. Zero power.

    So for the last month or so once in a while my 2010 would die out on the trail. That devolved to the battery not charging light coming on for the last week or so which i ignored. Then that devolved into the jeep not always starting.... I would just get one ignition click and would have to fedangle with the battery cables until the jeep would start. then when I was coming back from a road trip a few days ago I would get a ding every few seconds with the dash lights flashing and the speedo not reading momentarily. I assumed it was just a weak ground connection and carried on home. This then turned into today, my jeep not starting at all. I cleaned the terminals and all my aftermarket wiring which didn't help. So I bought a nice new (now agr) battery, made sure all of the og connections were snug. I didn't even bother to connect anything but the battery connections. That still didn't work. I tried jumpstarting both batteries to no avail. Now I'm left with a bricked jeep. I don't think this is a battery issue (ill buy a multimeter tomorrow) and I checked that all of my fuses were in. wut do? fried pcm?

  2. #2
    Meme King WJCO's Avatar
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    Sounds like a bad alternator to me. If you can get it started, while the Jeep is running, check the charging voltage at the battery. Using a DVOM, make sure it's set up to read voltage and put the red lead on the positive battery terminal and the black lead on the negative terminal. I don't know exact specifications but it really shouldn't drop below 13.5 volts while running.
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  3. #3
    Nothing but a Thing QuicksilverJK's Avatar
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    What WJCO said on the voltage is true. 13.5-14.5 is a good rule of thumb.
    What is puzzling is that now with a fresh battery you can't get it started. I have seen starter solenoids burn out by being operated at low voltage multiple times. If it's a manual you could roll start it to verify if you have a starter problem.


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  4. #4
    Nothing but a Thing Coop's Avatar
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    Quote Originally Posted by QuicksilverJK View Post
    What WJCO said on the voltage is true. 13.5-14.5 is a good rule of thumb.
    What is puzzling is that now with a fresh battery you can't get it started. I have seen starter solenoids burn out by being operated at low voltage multiple times. If it's a manual you could roll start it to verify if you have a starter problem.


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    I would be looking for an open ground. Perhaps the ground at the ECU.


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  5. #5
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    Does anything turn on (like dash lights or radio or anything) when you turn the key to ON?

  6. #6
    Fresh Catch supercell's Avatar
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    lol so it was just a loose connection. ive replaced the battery multiple times and i somehow still screw it up. theyre so sensitive

  7. #7
    Caught the Bug Lojo's Avatar
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    So lucky!!! I’ve been chasing a gremlin with my truck since April.... 3 different shops and no go still.... so I know what you went through!! Glad to hear you found it..!!


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  8. #8
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    Quote Originally Posted by supercell View Post
    lol so it was just a loose connection. ive replaced the battery multiple times and i somehow still screw it up. theyre so sensitive
    Glad you got it figured out!

    Quote Originally Posted by Lojo View Post
    So lucky!!! I’ve been chasing a gremlin with my truck since April.... 3 different shops and no go still.... so I know what you went through!! Glad to hear you found it..!!


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    Hope you can find out what's going on.

  9. #9
    Caught the Bug Lojo's Avatar
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    Quote Originally Posted by PEACEMAKER1 View Post
    Glad you got it figured out!



    Hope you can find out what's going on.
    Thanks!! Swapping injectors now so we shall see.. failed a bubble test so air is getting in. Fingers crossed!!

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