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  1. #1
    Petty Officer 2nd Class
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    Apr 2010
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    120

    Default brake lights & turn signals work but not running lights, which color wires are they?

    brake lights & turn signals work but not the running lights, which wires are they or how can i diagnose?

  2. #2
    Chief Petty Officer Bob's Garage's Avatar
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    Apr 2008
    Location
    Lakeland Florida
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    590

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    What is your tow vehicle? Have they ever worked? Are they incandescent or LED? The yellow is the left, green is the right and brown is for the running lights, white is the ground.

    You should start by verifying that the plug is working at the tow vehicle. This can be done by using a volt/ohm meter, a test light or a test plug with LEDs.

    If everything checks out, then you need to trace the wires looking for breaks. One of the things I do is use a straight pin, stick into the conductor and check for voltage with a volt meter. Then seal the pin hole with fingernail polish. If you look you will find it.

    Good luck, and I am sure there will be advise contrary to mine.
    Member and Boat Safety Instructor with the Lakeland Sail and Power Squadron;
    www.lakelandsailandpower.info

  3. #3
    Senior Chief Petty Officer
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    Jul 2005
    Location
    SE Michigan
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    785

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    Quote Originally Posted by exnavyman123 View Post
    brake lights & turn signals...which wires are they...?
    Please see the detailed color code wiring chart for trailers at

    http://continuouswave.com/whaler/ref...lerWiring.html

  4. #4
    Chief Petty Officer
    Join Date
    Apr 2011
    Location
    Michigan
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    498

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    yah, white is bolted to the trailer or wired to each light black is your running lights and side markers[also may be brown] then green and yellow are blinkers. most times after winter the salt corrodes your vehicals plug every 2-3 years needs replacing and often cleaning twice a year depending on if you live in a snowy area.

    hello jhebert, nice to see a fellow michigander on here few and far between
    repair shops are for the rich and lazy, want something done right? do it yourself.
    with knowledge grants perfection

  5. #5
    Petty Officer 2nd Class
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    Jul 2009
    Location
    Lockport NY
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    140

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    Donít overlook the fuses in the tow vehicle, if equipped. My truck has a separate fuse for both the trailer running lights and the brake/turn signals.
    I'd rather be snowmobiling!

  6. #6
    Chief Petty Officer
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    Apr 2011
    Location
    Michigan
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    498

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    when i blow the trailer plug fuse i have no speedo 95 f 150. differnt vehicals are equipt diferntly so double check them as well takes 2 minuties to find and check replace if bad.
    repair shops are for the rich and lazy, want something done right? do it yourself.
    with knowledge grants perfection

  7. #7

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    Hey, thanks for the help guys!! I spent hours trying to track a short on the trailer, when all the while it was a blown 15amp fuse in the fuse panel under the hood. 2007 Avalanche LTZ. All of the trailer fuses are under the hood in a fuse compartment for this truck. Thanks again, now I don't have to worry about launching early tomorrow!!

  8. #8
    Petty Officer 1st Class
    Join Date
    Sep 2010
    Location
    Chatham, Ont. Canada
    Posts
    331

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    White- ground
    Green- right signal (the R in green stands for right side)
    Yellow- left signal (L in yellow stands for left side) both these examples left and right are easiest to remember for the wiring challenged people
    Brown- tail and marker lights
    And if you have drum/disc surge you can also have a blue wire that operates the backup bypass on the surge cylinder so the brakes don't lock up when backing up on level ground to launck boat or park the trailer.
    Above all make sure your vehicle plug is wired right and you have a very good ground from it, if not you will get a lot wierd things happening with the lights such as bright signal bulb and markers lighting up at the same time AKA feed back looking for a ground
    Remember that if you stand there long enough looking at the problem someone will come along and either show you how to do it or do it for you.
    Boat: 1987 24' Doral Tara "KNOT HERS"
    Tow vehicle: 2010 F150 Crew Red Candy

  9. #9
    Petty Officer 2nd Class
    Join Date
    Apr 2010
    Posts
    120

    Default Re: brake lights & turn signals work but not running lights, which color wires are th

    Thanks for all the help guys, it turned out to be a corroded ground, bad ground under the trucks light where the wires ran back to back of truck for the trailer. bought a 12v test light and tested at the pins in the plug to find which pin was running lights and not lighting up and tried different things til it did, turned out to be just as useful as my multimeter

    Thanks again just wanted to thank yall, was fixed for awhile now .........

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