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Old 09-21-2020, 08:48 AM   #1
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Clearance light short

My 2006 Jayco TT appears to have a short in the clearance light wiring somewhere. It recently started blowing the 30 amp fuse in my truck every time I plug it in. All other lights work fine. It has about a dozen clearance lights, and of course the wiring is all inside the walls of the camper, so I have no idea how to begin tracking this down to fix it. So other than not driving after dark, does anyone have any ideas on where to begin?
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Old 09-21-2020, 09:20 AM   #2
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Unplug from truck....In the trailer plug, use a jumper to connect the top two contacts in the plug together.....if lights work, then it's a truck issue....contacts at the 11 and 1 o'clock position...tail lights are on same circuit as clearance lights...
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Old 09-21-2020, 09:31 AM   #3
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Unplug from truck....In the trailer plug, use a jumper to connect the top two contacts in the plug together.....if lights work, then it's a truck issue....contacts at the 11 and 1 o'clock position...tail lights are on same circuit as clearance lights...
Tried that already. Lights don't work, and the LP alarm goes off indicating it's seeing a low voltage, so I'm definitely getting a short in the trailer somewhere. Thanks for replying though!
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Old 09-21-2020, 09:34 AM   #4
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Have you looked in trailer plug and where the pigtail is connected to trailer?

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Tried that already. Lights don't work, and the LP alarm goes off indicating it's seeing a low voltage, so I'm definitely getting a short in the trailer somewhere. Thanks for replying though!
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Old 09-21-2020, 10:04 AM   #5
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Have you looked in trailer plug and where the pigtail is connected to trailer?
Yes. Trailer plug goes into a junction box, so I disconnected the wire there and connected the trailer wire to the battery, bypassing the plug. Same results as above.
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Old 09-22-2020, 04:36 PM   #6
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Did anyone do an repairs or drive any nails or screws into a wall? If so it is possible a couple of wires got nicked.
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Old 09-22-2020, 05:40 PM   #7
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I once or twice used a auto reset circuit breaker to chase a short in marker lights.

Powered them up and watched for any kind of glow from them. The ones that didn't glow were the ones I pulled out to check the wiring.
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Old 09-23-2020, 10:16 AM   #8
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I repaired some water damage on the front end last year, but tried to be careful about the wiring, and everything worked fine until recently, but you never know. Definitely don't want to take everything apart again if I can help it! Good idea about the auto-reset circuit breaker. I'll definitely try that. Those 30 amp fuses get expensive to experiment with!
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