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Old 11-23-2020, 11:01 AM   #1
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Blue Ox Jeep Socket Removal

I'm trying to troubleshoot my Jeep's left turn signal not working when it's plugged into the coach. The coach is sending a turn signal, and the continuity on the cable is fine. So my issue seems to be at the Jeep. The brake lights work.

I figured I'd check the wiring behind this plug. But when I take those two bolts out, it doesn't seem like the socket comes loose---tight as a drum. I'm reluctant to start yanking on it. Can I pull out a bit so I can check the wires? Or is it held in place some other way?

And, if this socket wiring checks out---what should I suspect next?

All clues very much appreciated...
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Old 11-23-2020, 11:08 AM   #2
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Quote:
Originally Posted by bsaldeen View Post
I'm trying to troubleshoot my Jeep's left turn signal not working when it's plugged into the coach. The coach is sending a turn signal, and the continuity on the cable is fine. So my issue seems to be at the Jeep. The brake lights work.

I figured I'd check the wiring behind this plug. But when I take those two bolts out, it doesn't seem like the socket comes loose---tight as a drum. I'm reluctant to start yanking on it. Can I pull out a bit so I can check the wires? Or is it held in place some other way?

And, if this socket wiring checks out---what should I suspect next?

All clues very much appreciated...
Removing those two bolts should release the socket body from the holder on the bumper. The flange with the bolt holes is part of the socket.

Once that is done, the socket is disassembled by loosening/removing the small screw on the body of the socket itself, found behind the flange on the socket's round body. It is either a phillips head slot head. Remove that screw and the front end of the socket pulls out from the front of the flange by pushing the wiring harness into the socket body from the rear. If the socket body, behind the flange, is wrapped in tape, you may need to remove some to allow the wires to move forward into the socket so the plugs are visible out the front end.
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Old 11-23-2020, 11:14 AM   #3
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Once you pull those 2 hex head bolts, the whole plug assembly should be loose. How loose depends on how tight the jeep wire harness coming out the back of the plug is. Get under there and see if you can pull a bit of slack from anywhere along that wire. Some of the mechs that install these plugs pull the harness so tight you cannot get any room to work. You might have to snip some zip ties to get the slack you need. To get the plug assembly out of the case, there's a small Phillips screw in the side of the case that has to be removed. (DO NOT REMOVE WHEN JEEP IS SITTING IN THE GRASS, LOL). Once that screw is out the case that you see in your picture should slide to the rear exposing the wires and connections. Some plugs also have 2 screws holding a strain relief at the back of the plug that also has to be removed. Time for a good back pad as you'll be laying down for a lot of the work.
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Old 11-23-2020, 11:39 AM   #4
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Thank you both! I'll tackle it tomorrow when it warms up. Unfortunately we're on gravel--better than grass for finding missing screws but not very comfy on your back!

Thanks again!
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Old 11-23-2020, 05:16 PM   #5
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Thank you both! I'll tackle it tomorrow when it warms up. Unfortunately we're on gravel--better than grass for finding missing screws but not very comfy on your back!

Thanks again!
Spread a big towel or tarp. I speak from experience. If these damn things grew, I'd have at least 500 plants and a great crop in the yard. (LOL) Good luck.
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Old 11-23-2020, 09:54 PM   #6
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Originally Posted by Pigman1 View Post
Once you pull those 2 hex head bolts, the whole plug assembly should be loose. How loose depends on how tight the jeep wire harness coming out the back of the plug is. Get under there and see if you can pull a bit of slack from anywhere along that wire. Some of the mechs that install these plugs pull the harness so tight you cannot get any room to work. You might have to snip some zip ties to get the slack you need. To get the plug assembly out of the case, there's a small Phillips screw in the side of the case that has to be removed. (DO NOT REMOVE WHEN JEEP IS SITTING IN THE GRASS, LOL). Once that screw is out the case that you see in your picture should slide to the rear exposing the wires and connections. Some plugs also have 2 screws holding a strain relief at the back of the plug that also has to be removed. Time for a good back pad as you'll be laying down for a lot of the work.
EXCELLENT ADVICE! And yes, for some odd reason, some techs and, even the factory bone heads, tend to be either real chincy with the amount of wiring behind a fixture, or just like to be really thorough and not have slack. In either case, it's a royal P. I. T. A. !!!!!!!!!!!! I mean, geeeeze, what would it cost to put an extra 3"-6" of wiring behind that trailer plug or any fixture that's electrical to get a future owner (or tech) something to work with when trying to diagnose an issue?

As for the OP's issue with a tight plug, AFTER the two bolts have been removed, well, yeah, from here it's hard to diagnose. In reality, it's just like what's been said, once the screws/bolts are out, the fixture should just fall out. Maybe someone with energy, put a hose clamp around the back side of that plug to keep it in place, JUST IN CASE the two normal retaining screws fell out while under way, who knows?
Scott
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Old 11-24-2020, 10:54 AM   #7
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Made progress today! Got the front socket off (it was zip tied with no slack) and discovered one of the pins had no connection. But there was also no unconnected wire visible.

"Where'd the wire go?" I thought. But when I looked up the pin-out chart, it was the wire for the non-used electric brake (we have an AF1). The left turn signal pin & wire was just fine. Sealed it back up.

I moved back to the tail light assembly--it looks like the wires were spliced back there, but not absolutely sure. Everything looked ok.

Plugged the jeep into the coach, turned the left turn signal on, and voila! it worked. My only issue is I didn't really fix anything--I just opened stuff up, looked at it, and put it back together again. So although it's working, I'm suspicious...

No screws were lost! One went missing for a minute. ;-)

Thanks to everyone that chimed in...very much appreciated.
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Old 11-25-2020, 11:31 AM   #8
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Glad everything is "fixed", but it is discomforting to not know what you actually did!

Do you have the factory tow wiring harness in your Jeep?

I ask because, typically, the brake lights and turn lights receive the same wire from the MH and use the same bulb in the Jeep. In other words, if the brake light works the turn signal works if the MH is sending the pulsating current. You stated that the plug at the MH does, in fact, send the pulsating turn current. Logically, then, the Jeep turn signal should flash because it is the same wire and bulb for the brake light.

However, I believe Jeep offers a factory installed wiring harness for towing. If so, it may be wired completely differently than a typical after-market set-up and involve using different circuits and bulbs in the Jeep. If that is the case, let's hope you stumbled upon the fix and the issue doesn't repeat. If it does, you may have to contact Jeep for a wiring diagram of the harness connections.
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