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Electrical issue, what does this mean?

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stef73433
Posted 2018-04-14 8:31 PM (#171520)
Subject: Electrical issue, what does this mean?


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Posts: 75
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Location: WI
I have a 7 way big round plug on my truck. When I insert test light, the 12v light and the brake light both light up. I gather there's an issue with brakes, but what are the possible issues I need to look at? Trailer shop said it was back feeding and they cut power to my brake box and light went off. I installed new brake box, no different so I don't think brake box is the issue. What else can I check? I'm very novice with lighting if you hadn't guessed.
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beeoerdog
Posted 2018-04-14 9:36 PM (#171521 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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Not sure...the voltage you see on the test plug light might only be a small current used to tell if a trailer is connected. Try a real test light to the brake prong and ground and see if it lights up....test light draws more current than the led on your test plug. Operate the brake controller slide switch and see if the the test light changes when you move the slide. Does the controller operate the brakes? You can also plug in the trailer and listen ate the wheel hubs and you will hear noises coming from the brakes. There is a trailer plug wiring link on this site to find the proper prong to test
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PaulChristenson
Posted 2018-04-15 12:47 PM (#171522 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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Are you performing TESTING THE TRUCK / VEHICLE plug pins in this fashion?

http://www.centrevilletrailer.com/how-to/fix-trailer-lights/

Edited by PaulChristenson 2018-04-15 12:49 PM
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beeoerdog
Posted 2018-04-15 1:01 PM (#171524 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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great link
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stef73433
Posted 2018-04-15 4:03 PM (#171525 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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No, dealer used a plug like in the link. I'm going off what they told me but I don't have much faith after I fixed brake controller and still having same issue. We are thinking the issue night actually be my light plug and it bring wired slightly incorrect.https://www.etrailer.com/Wiring/Tow-Ready/TR20117.html?feed=npn&gclid=Cj0KCQjw8MvWBRC8ARIsAOFSVBVqApDuaCzIKZZy2IsGtfC-SqCR_H53eKWMGgTB1u0V5_dEUZtd6NAaAuSrEALw_wcBhttps://www.etrailer.com/Wiring/Tow-Ready/TR20117.html?feed=npn&gclid=Cj0KCQjw8MvWBRC8ARIsAOFSVBVqApDuaCzIKZZy2IsGtfC-SqCR_H53eKWMGgTB1u0V5_dEUZtd6NAaAuSrEALw_wcB

Edited by stef73433 2018-04-15 4:10 PM
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beeoerdog
Posted 2018-04-15 4:13 PM (#171526 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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Location: Los Angeles, Ca.
use a test light, not the test plug.
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PDGx
Posted 2018-04-16 8:14 AM (#171527 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?



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Location: Florida
For those who have multiple trailers, this unit will save you countless hours of troubleshooting lighting problems.

https://www.northerntool.com/shop/tools/product_200623537_200623537

Also works as a convenient portable 12v power supply.
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PaulChristenson
Posted 2018-04-16 11:57 PM (#171528 - in reply to #171525)
Subject: RE: Electrical issue, what does this mean?


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Location: Vermont
If this is the device that had two lights on...then you want to take the truck plug apart because you have corrosion in the plug that is tying the 12 volt power circuit to the brake circuit. 
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stef73433
Posted 2018-04-17 1:44 PM (#171529 - in reply to #171528)
Subject: RE: Electrical issue, what does this mean?


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Location: WI
PaulChristenson - 2018-04-16 11:57 PM

If this is the device that had two lights on...then you want to take the truck plug apart because you have corrosion in the plug that is tying the 12 volt power circuit to the brake circuit. 

Did. Plug is clean, no corrosion
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PaulChristenson
Posted 2018-04-18 3:16 AM (#171530 - in reply to #171520)
Subject: RE: Electrical issue, what does this mean?


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20001000500100100100
Location: Vermont
https://www.etrailer.com/question-214505.html 
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stef73433
Posted 2018-04-19 9:56 PM (#171532 - in reply to #171530)
Subject: RE: Electrical issue, what does this mean?


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Posts: 75
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Location: WI
PaulChristenson - 2018-04-18 3:16 AM

https://www.etrailer.com/question-214505.html 

Thank you, that was informative!
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