'12 JKUR rear locker blowing fuse - JeepForum.com
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Unread 04-14-2014, 10:56 PM   #1
skrach77
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'12 JKUR rear locker blowing fuse

I am having an ongoing issue with my rear locker. Everytime I try to engage it, it blows the fuse for the lockers. I have tried running a new power and new ground wire for it, still blows the fuse. If I unplug the rear locker at the diff, I can call for the rear (which just blinks) and then the front, and the front engages immediately.. Any ideas?

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Unread 04-14-2014, 11:53 PM   #2
SubAtomicGenius
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Sounds like the solenoid coil or the internal wiring for the locker is shorted out.

You can disconnect the wire at the locker and measure the resistance across the terminals (locker electro-magnetic coil). I'm not sure what the resistance should be exactly.... however, if you read a low resistance - i.e. very near or at zero for a short circuit - your current will increase over the fuse rating and the fuse will blow everytime you throw the switch.
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Unread 04-15-2014, 12:06 AM   #3
ronjenx
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Quote:
Originally Posted by SubAtomicGenius View Post
Sounds like the solenoid coil or the internal wiring for the locker is shorted out.

You can disconnect the wire at the locker and measure the resistance across the terminals (locker electro-magnetic coil). I'm not sure what the resistance should be exactly.... however, if you read a low resistance - i.e. very near or at zero for a short circuit - your current will increase over the fuse rating and the fuse will blow everytime you throw the switch.
The coil on the locker I have, which works well, is 3.8 ohms.

Could be the electromagnet in the locker has rotated, pulling the wires out of it, and the bare wire ends are shorted together inside the differential housing.
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Unread 04-15-2014, 01:19 AM   #4
SubAtomicGenius
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Should be about 3 amps to operate it at 12 volts. What size is the fuse?
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Unread 04-15-2014, 07:33 AM   #5
skrach77
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It's a 20 amp fuse
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Unread 04-15-2014, 07:37 AM   #6
skrach77
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I've got this evening to figure it out. I leave for Moab for EJS first thing tomorrow. It's so frustrating to be getting to take the jeep trip of my dreams, and my jeeps broken
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Unread 04-16-2014, 12:41 AM   #7
skrach77
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I've got the rear diff cover off right now, and the ring that the wires connect too has some play in it- is that normal?
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Unread 04-16-2014, 08:44 AM   #8
ronjenx
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Quote:
Originally Posted by skrach77 View Post
I've got the rear diff cover off right now, and the ring that the wires connect too has some play in it- is that normal?
Is the anti-rotation tab properly engaged on yours?

What direction, and how much play do you have?
Can you rotate it? Or can you slide it back and forth sideways?

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Unread 04-18-2014, 10:29 PM   #9
skrach77
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In mine, that tab is not fully engaged and rather than the pin being square, it's noticeably worn on one corner. The other piece does rotate some back and forth as it hits that worn pin. I don't remember any side to side play, but have slept a little since I had it apart.
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Unread 05-01-2014, 01:15 PM   #10
skrach77
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So here's an update, it's kinda funny- we unplugged my locker and ran a jumper loop to a buddy's locker in his jeep, and my jeep saw it, locked it, and the light in my dash worked like it's supposed too.

Problem has to be in my locker
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Unread 05-01-2014, 02:01 PM   #11
MudDuck99
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is it still under warranty?
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Unread 05-01-2014, 04:32 PM   #12
mrwhipple
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Drive train warranty should cover it. 5yrs/100,000 miles
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Unread 05-01-2014, 07:28 PM   #13
222Doc
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sounds like the wire going into the electromagnet shorted out.
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Unread 05-02-2014, 12:17 PM   #14
skrach77
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I'm not the original owner, no warranty. I'm thinking it's the wires inside as well
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Unread 05-02-2014, 12:57 PM   #15
ridesno4llfe
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Quote:
Originally Posted by skrach77 View Post
I'm not the original owner, no warranty. I'm thinking it's the wires inside as well
Factory warrenty follows the vehicle with the exception of the lifetime warranty. Check with jeep it should have coverage.
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