What is this part

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Ramil

New member
Joined
Aug 15, 2018
Posts
4
Hello, I'm wondering if anybody could help me identify this part on my 5th wheel. It is in a box in the back of the king pin. The box has some wiring and 3 fuses. This part to the right looks to be a contact or solinoid of some sort but I really dont know. The box was damaged and when I move it this part made contact and arced in the box. The part is pulled away from its housing that is still screwed in the box. Any help is greatly appreciated. Thx
 

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Utclmjmpr

Well-known member
Joined
Sep 14, 2009
Posts
5,086
Location
Cedar City, UT
  The top image appears to be a fuse holder with three 7.5 amp fuses,, the bottom is just a mess of wires because it's too close.>>>Dan
 

lynnmor

Well-known member
Joined
May 14, 2013
Posts
1,586
The empty rectangular can on the right side and the thing with the wires attached are a dissembled/broken auto resetting circuit breaker.  Remove both parts and get a new one at any auto parts store.
 

John From Detroit

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Apr 12, 2005
Posts
24,807
Location
Davison Michigan
Yup the damaged part is a self resetting circuit breaker

Take the case off and you should find the amprage printed on it. take it to autp parts are us (any auto parts place) and they SHOULD have a rack of replacements, possibly behind the counter. Possible in front.  Very common part.
 

Lou Schneider

Site Team
Joined
Mar 14, 2005
Posts
10,912
That box contains the fuses and a circuit breaker for the wiring coming from the tow vehicle through the umbilical cord.

The three fuses are for the trailer's left turn signal/stop light, right turn signal/stoplight and tail lights/running lights.

Like others said, the empty box with the two terminals hanging below it is a self resetting circuit breaker.  It's on the charging line coming from the tow vehicle to the trailer battery.  The sparks came from it being connected to the trailer battery, so de-energize the trailer's 12 volt system while you work on  it.

Unplug the trailer from electricity and the tow vehicle, then remove the wire(s) from the Negative terminal of the trailer battery to de-energize the trailer..
 

Ramil

New member
Joined
Aug 15, 2018
Posts
4
Wow. Thank you all for the info. Just picked up the new breaker $6.99. Good learning experience. I may have waited years before opening that box if it hadn't had an issue. Thanks again.
 
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