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intermittent electrical problem with trailer

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Last activity 2019-04-14 5:08 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: 3

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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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: 3

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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headhunter
Reg. Oct 2004
Posted 2019-04-12 12:10 PM (#172321 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer



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Location: Western WA
I have a similar problem with the running lights on my trailer. I am not sure where to start troubleshooting. I have zero electrical experience. I am a little discouraged that the best advice is to just rewire the lights. Will be a little more complicated for me with all the running lights than it would be to just rewire the right side brake lights to solve the problem the OP shared. This is a LQ trailer so likely means pulling paneling off the interior to get to the wiring in the gooseneck. As I look at the trailer the mid-trailer running light is above the area where the shower is located, etc. The plug-in end was replaced last time I had the trailer serviced. Is it possible the problem is in the plug-in end?

Like to OP I have multiple trailers so have narrowed it down to a problem with this trailer, not with the truck. 

Also interested in learning more about this self resetting circuit breaker.  

Edited by headhunter 2019-04-12 12:12 PM
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DLR
Reg. Jul 2004
Posted 2019-04-13 5:42 AM (#172322 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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Did you have problems before the plug was changed?   
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headhunter
Reg. Oct 2004
Posted 2019-04-13 1:15 PM (#172325 - in reply to #172322)
Subject: RE: intermittent electrical problem with trailer



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Location: Western WA
I wish I could remember.  Its been an itermittent problem for a while, so my guess is yes. 

I know, if the answer was no the troubleshooting would most certainly point to the plug.  
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DLR
Reg. Jul 2004
Posted 2019-04-14 5:08 AM (#172327 - in reply to #171794)
Subject: RE: intermittent electrical problem with trailer


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Posts: 126
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Location: Minnesota
I would still start with the plug and make sure you have a good ground connection.  Just helped a friend with blinking lights and the screw holding the ground wire was loose.  The screw was difficult to find but the fix was easy. 
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