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  1. #21
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Xspook View Post
    ... not sure how to test if they actually work or not...
    I am suspecting there is an error in the trailer wiring. Perhaps where the replacement connector was wired into the wiring at the back, or perhaps up front at the tongue. Or even, possibly, in the vehicle wiring.

    I suggest doing basic wiring checks on the trailer. Do not assume anything is wired correctly, let’s verify the wiring is actually correct.

    Get a digital multimeter.

    And some alligator test wires.

    Click image for larger version. 

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    Also buy a spare pigtail connector for the trailer lamp (3-pin connector with short wire leads), so we can test the LED lamps.

    Rig up the 12 volt ‘battery’ thing I posted previously.

    Report back, and we can walk you through the testing process.


  2. #22
    Xspook's Avatar
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    I think I have it figured out.

    Appears that the ground wire to the side marker light was bad. It splits off of the tail light ground wire. Once I got the new LED working, it flickered when I started to move the side marker light in to place. I replaced that wire and all seems good now...time will tell.

    Regarding the LED's not working at all when I swapped them out, they did require a bit of "experimenting" with the connections, but eventually got them going

    Thanks to all with the help.

    Oh, and to add to the frustration, I ended up blowing the trailer light fuse on my Nissan Frontier and that sucker is quite the PITA to replace! Had to disconnect 6 wiring harnesses just to gain access to the fuse. Then I had to use some elongated curved hemostats just to extract/replace it. I keep a pair of the curved hemostats in my ski to remove garbage from the pump.


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  3. #23

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    May 2016
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    I went through this myself and finally found a nick on the wire running through the tubing of the trailer

  4. #24
    Yep....keeping the lights working on boat trailers is a challenge. I agree making good solder connections is the way to go. A while back I picked up a Light Tester box from light-tester.com to check my lights regularly, it is sure a time saver.

    Mike

  5. #25
    I always run a separate ground wire to each light from the tow vehicle instead of grounding to frame. I find much more reliable and a much cleaner install.

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