2010 Jeep Jk Rubi Electrical issue - JeepForum.com
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post #1 of 6 Old 03-09-2019, 08:12 PM Thread Starter
Yousef Maqousi
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2010 Jeep Jk Rubi Electrical issue

Pardon me if I’m posting this in the wrong place. If so let me know and I’ll move it. I’ve got a 2010 Rubicon and recently it’s doing some crazy stuff. I’ve worked on cars my entire life but electrical has never been my strong suit.

So about a month ago my Jeep started randomly not starting. It acted like the battery was dead but it wasn’t. Headlight switches, dash lights, radio, ignition switch, power locks, key fob, windshield wipers, turn signals and hazards stopped working. Put the key in and literally nothing happens. Checked all the grounds, battery and alternator and everything’s working as it should be. Here’s where things get wired. It will randomly come back to life. Sometimes it cranks and everything’s fine and after sitting an hour or so it becomes a paperweight. Only to wake up when it feels appropriate. For awhile I could pull the ground off the battery or pull the WCM fuse to reset it and it would work. But that proved fruitless the last time it acted up. I’ve done some research and I’ve narrowed it down to either the Wireless Control Module, ECM or TIPM. I just need some help diagnosing the issue. I’m strapped for cash at the moment and would like to avoid the dealership ghost hunt. Any advice is greatly appreciated. I have videos of what it’s doing if that helps.

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post #2 of 6 Old 03-10-2019, 10:09 AM
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This is basic trouble shoot for a technician, with a test light and a wiring diagram go thru the starting circuit when issue arises.

WCM and ECM are low on my suspect list.
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post #3 of 6 Old 03-11-2019, 06:52 PM
Joe Dillard
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post #4 of 6 Old 03-19-2019, 10:47 AM Thread Starter
Yousef Maqousi
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Thanks, I’ll pull a wiring diagram and get started.
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post #5 of 6 Old 03-20-2019, 03:25 PM
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MIne did this... when I needed an alternator. My Jeep stopped running on city street... when I needed a battery. Youd think it was the other way around.

Basically, the JK computer is super sensitve to voltages and wont let it start. If you pull the batt fuse or disconnect the red wire, and reattach, it is like a reset and itll pop off. Trying to diagnose batt/alt in a JK is not intuitive. The advance auto parts tool is not accurate. Isolate and test. Do a real diagnosis. When I needed an alternator, they scanned and told me I needed a battery. Bought new Optima. week later doing same thing.... Batt dead. Alternator was what was wrong.

My current set up is an Optima Yellow and a mean green 220 with XS big 3 0 guage and a NOCO batt tender connected when parked. Havent had a problem since 2014. Hard wheeling with lots of winching.

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post #6 of 6 Old 03-20-2019, 08:41 PM
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The older (3.8L) version JK requires a good engine block ground for both the neutral safety switch and the starter. Try running a 4 gauge ground cable from the battery negative terminal to the alternator bracket.
You can do a quick check with a jumper cable from negative battery to alternator bracket to see if it solves your problems. All 3 of our pre 2012 JKs required the extra ground cable.

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