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Old 07-29-2019, 10:12 AM
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New battery, no start

My mechanic canít figure this out, so here I am.
I have a 2014 JKU. The battery died so i picked up a new (tested good) one from Samís Club. I dropped it in and there was nothing. The only thing connected are the cables at the moment. None of the auxiliary stuff. No dash lights, no starter clicking. Nothing. Just like itís not even connected. Fuses appear to be good.
My guy thinks it might need to go to the dealer. You can jump it and it will run for a short time then die. He swapped in a known good battery and the same thing occurs. The alternator seems to be okay and will vary in voltage which he says is normal but it will skip around 12-14 volts, then drop to zero and go back up again.

Anybody got any ideas? Iíd hate to pay for a new computer.


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Old 07-29-2019, 10:27 AM   #2
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Sounds like a short of positive to ground. Any sparks when connecting the cables?

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Old 07-29-2019, 10:41 AM
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No sir. Iíve never seen anything like this before. Like most of us Iíve lost track of how many batteries Iíve replaced over the years.
How would one check for that? In case the mechanic canít figure it out.


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Old 07-29-2019, 12:13 PM   #4
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Quote:
Originally Posted by sgpd1sam View Post
My mechanic canít figure this out, so here I am.
I have a 2014 JKU. The battery died so i picked up a new (tested good) one from Samís Club. I dropped it in and there was nothing. The only thing connected are the cables at the moment. None of the auxiliary stuff. No dash lights, no starter clicking. Nothing. Just like itís not even connected. Fuses appear to be good.
My guy thinks it might need to go to the dealer. You can jump it and it will run for a short time then die. He swapped in a known good battery and the same thing occurs. The alternator seems to be okay and will vary in voltage which he says is normal but it will skip around 12-14 volts, then drop to zero and go back up again.

Anybody got any ideas? Iíd hate to pay for a new computer.


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Hi sgpd1sam,

Iím sorry to hear of the trouble youíre experiencing with your Wrangler. If you do decide to move forward with your local FCA dealer, please do not hesitate to send us a private message. We would be happy to escalate a case on your behalf and connect you with a Case Specialist who can work alongside your dealer to find a potential solution.

Mark
Jeep Social Care Specialist
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Old 07-29-2019, 12:17 PM
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Thank you Mark.


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Old 07-29-2019, 01:55 PM   #6
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Charge up the battery and quickly trade it in on a new JLUR. LOL.
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Old 07-30-2019, 12:50 AM   #7
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Sounds like a short in the fuse box, or a problem with your ECU. I know the pain of chasing wires, so I wish you luck 😄
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Old 07-30-2019, 02:06 AM   #8
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Maybe the new battery is no good. Take it back and test it.
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Old 07-30-2019, 10:34 AM
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The battery is good. My mechanic tested it. The same thing happened with another known good battery.


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Old 07-30-2019, 01:01 PM   #10
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So putting a new battery yields nothing while jumping it will allow your Jeep to start for a short time? You're jumping it from the battery terminals that a known good battery is also connected to?

This makes no sense. It sounds like you need to find another battery. Maybe the shop testing your battery isn't all that great?

Try checking the voltage at your current battery while not starting the Jeep. Voltage should be between 12 to 14 (ish) volts. Then keeping the multimeter connected, try and start the vehicle and see what the voltage drops to. If it drops below 10 volts then the battery is the issue and also the shop testing the battery.
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Old 07-30-2019, 01:03 PM   #11
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Another possibility is that your battery terminals are very sorry where they contact the battery post. Check to be sure they're clean and making good contact with the battery.
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Old 07-30-2019, 11:42 PM
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I canít speak to the alternator, but itís at the stealership now. Iíll post up what they find out. The battery posts and cables are bright and shiny. Nice and tight on the battery.


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Old 07-31-2019, 08:24 PM
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Well, the dealership finally got around to looking at my Jeep. The battery was 100% dead. They pulled the battery and I took it back to Samís. They exchanged the battery with no questions but did check the one the dealer said was bad, the first one I bought.
Apparently nobody had ever seen a battery do this, but it registered at 13V. Then it dropped to nothing. Then back up again. They tested it several times and it would register as fully charged, then nothing more than a lead weight.
Put the new battery in and all is good now. I still have to pay for the dealers technicians time, so I guess Iíll hit Sams up for $ 100 worth of hot dogs.
Thanks to all who chimed in.


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Old 07-31-2019, 10:22 PM   #14
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I'm glad everything is working well now. However, that's why I suggested above to check voltage while trying to start the Jeep. When a shop tests the battery they shouldn't just test a no load voltage. They should put a draw on it and check voltage as well.
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Old 08-01-2019, 02:56 AM   #15
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They definitely don’t make batteries like they did 10 years ago. With what you initially described battery all the way. Creates a mind flub because it’s new but the facts are the facts.
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Old 08-01-2019, 12:07 PM
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I donít know if the F word I had in mind was ďflubĒ, but yeah. Iíve never had a bad new battery in my life so it really did throw me for a loop. Plug and play then off you go. I figured it would be the ECU for sure.


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