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intermittent electrical problem with trailer

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Last activity 2018-09-22 5:54 AM
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bertamay1
Reg. Aug 2018
Posted 2018-08-09 2:52 PM (#171794)
Subject: intermittent electrical problem with trailer


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Posts: 2

all the lights work when I hook up and leave, but somewhere on the road, a fuse blows for the right side brake/blinker (on one truck with separate fuses) The primary truck used is a Ford with towing package and separate towing fuse for both brake lights. All wires and plug have been checked and test properly and I was advised by a reputable trailer service/dealer to try a circuit breaker with auto reset until the short shows itself permanently. I purchased an auto reset 20a blade circuit breaker but it does not fit in the fuse box...too tall. Both trucks used to haul this particular trailer have no problem with other trailers.

Any experience with this and any suggestions on where to purchase a shorter circuit breaker. The one I purchased online is an Eaton Bussman. No local auto parts stores seem to carry these.

Any suggestions on how to locate this? All wires behind tail lights are intact with no bare or crimped spots.

thanks
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beeoerdog
Reg. Jan 2014
Posted 2018-08-09 3:38 PM (#171796 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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maybe leave the cover off the box
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beeoerdog
Reg. Jan 2014
Posted 2018-08-09 6:54 PM (#171797 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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Posts: 437
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Location: Los Angeles, Ca.
also check the trailer connector....sometimes the wires are loose inside
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bertamay1
Reg. Aug 2018
Posted 2018-08-10 7:36 AM (#171799 - in reply to #171797)
Subject: RE: intermittent electrical problem with trailer


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Posts: 2

thanks for your replies. The trailer connection plug was replaced when trailer purchased from the dealer less than a year ago. It has been opened and checked for loose wire connections, but is it possible that the plug itself is defective or is this unlikely?
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beeoerdog
Reg. Jan 2014
Posted 2018-08-10 8:08 AM (#171801 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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Location: Los Angeles, Ca.
unlikely... you could also wire in an automatic reset breaker that has terminal posts on the suspect wire until it fails
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justgurn
Reg. Oct 2010
Posted 2018-09-10 2:24 PM (#171860 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer



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Finding the bad spot is going to be labor intensive which is why the trailer repair shop suggested the self resetting breaker. They work great until the wire burn in to and you don't have lights. Many times the wire is ran in the roof corner channel and the wire drops down to the lights. This would be where I would look first for a cut spot.
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PaulChristenson
Reg. Jan 2007
Posted 2018-09-22 5:54 AM (#171878 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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Simplest solution is to rewire the right side of the trailer's light wiring...chasing intermitent wiring bugs are extremely difficult
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