truck running lights but no trailer running lights??
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truck running lights but no trailer running lights??

  1. #1
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    Default truck running lights but no trailer running lights??

    k here is my problem
    i have no running lights on any trailer i hook up to..
    i have blinkers and break lights on the trailers just no running lights

    i pulled the fuse panel on the side of my dash and one of the fuses was popped i replaced it but it fixed nothing..

    all the lights on the truck work

    i remember a thread about something similer to this before thanks for any input

    is there any other fuse blocks i need to check or or something that could cause this?

    thanks sean

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    Senior Member hava life's Avatar
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    Do you have voltage to the Brown wire on your vehicle jack?

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    get a voltmeter and test for 12v at the plug, then at the light(s). also are the lights trailer grounded or are grounds ran back to the plug?

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    Ralphs club member LSXINDUSTRIES's Avatar
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    What year / make truck do you have?
    I am on a drug. Its called Charlie Sheen. Its not available because if you try it, you will die. Your face will melt off, and your children will weep over your exploded body.



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    05 chevy duramax2500

    it's not the trailer it's every trailor I hook up to.. I'll get out my meter in the morning and chevy the voltage..

    There isn't a fuse for trailers under the hood is there?
    Last edited by bunkrepair; 10-09-2010 at 09:21 PM.

  7. #6
    Senior Member hava life's Avatar
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    This would be the normal wire color for a 4 way
    White- Ground
    Brown-Running light
    Yellow- Left turn/brake
    Green- right turn/brake

    5-way- red and black are aux. power
    6-way- blue is electric brakes
    7-way- purple is back-up

    After you check your vehicle plug then work your way back on the trailer.

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    Default All trailers

    Quote Originally Posted by hava life View Post
    This would be the normal wire color for a 4 way
    White- Ground
    Brown-Running light
    Yellow- Left turn/brake
    Green- right turn/brake

    5-way- red and black are aux. power
    6-way- blue is electric brakes
    7-way- purple is back-up

    After you check your vehicle plug then work your way back on the trailer.
    I doubt the problem is on the trailer because he says it is on every trailer he hooks to. It has to be the truck. Check the truck's brown wire at the plug, then push the tester through the insulation and see if the wire has current before it enters the plug...Is this a factory trailer package?? Or an add on??.... AND, since the brake/turn lights work, it isn't the trailer ground either..It has to be lack of 12V coming from the truck, either @ the female plug, or up stream from there in the truck wiring... Since all the truck lights work, it almost has to be between the truck tail light(s) and the plug, or the plug connection inside... Not that difficult really, either the plug has juice, or it doesn't.....

    Ray
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    Senior Member hava life's Avatar
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    Quote Originally Posted by Moneypit View Post
    I doubt the problem is on the trailer because he says it is on every trailer he hooks to. It has to be the truck. Check the truck's brown wire at the plug, then push the tester through the insulation and see if the wire has current before it enters the plug...Is this a factory trailer package?? Or an add on??.... AND, since the brake/turn lights work, it isn't the trailer ground either..It has to be lack of 12V coming from the truck, either @ the female plug, or up stream from there in the truck wiring... Since all the truck lights work, it almost has to be between the truck tail light(s) and the plug, or the plug connection inside... Not that difficult really, either the plug has juice, or it doesn't.....

    Ray
    That would be the same as WORK YOUR WAY BACK ON THE TRAILER since this was AFTER you check the vehicle

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    Quote Originally Posted by bunkrepair View Post
    05 chevy duramax2500

    it's not the trailer it's every trailor I hook up to.. I'll get out my meter in the morning and chevy the voltage..

    There isn't a fuse for trailers under the hood is there?
    Check the factory harness the metal contacts sometimes need to be realiigned

  11. #10
    Rio
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    Listen to Ray. If power to the pigtail with whatever hot you're using (black or brown) then it's prolly the ground. Use a test light and any "hot" to test the ground to the trailer. Really pretty simple but I'm shit-faced and can't think straight at the moment.
    "lol".
    Rio

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    Default Grounded

    Quote Originally Posted by Rio View Post
    Listen to Ray. If power to the pigtail with whatever hot you're using (black or brown) then it's prolly the ground. Use a test light and any "hot" to test the ground to the trailer. Really pretty simple but I'm shit-faced and can't think straight at the moment.
    "lol".
    Rio
    If it were the trailer ground, the turn/brake lights wouldn't work either, and what are the chances that every trailer he hooks to has a bad running light ground??.... As mentioned, the factory harnesses DO fail inside the female plug, so that is where to start... Then to the "hot" just before the truck plug, under the bumper..... But chances are best it is in the truck's plug.....

    Ray
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    ive had the same issues before too, went all the way to hard wiring my running lights to my trailer after i checked and redid every connection on the trailer. Got it all ready to head out of town and it ended up being a fuse. Im pretty sure it was the trailer with a bad ground or something, because 3 different trucks hooked up and no running lights on either, come to find out it kept blowing fuses.

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    Default Fuse

    On my Ford F-250 the fuses for the trailer plugs and other auxillery type of items are found in the fuse compartment under the hood. Check the owners manual what fuse feeds the trailer lights.

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    Quote Originally Posted by bunkrepair View Post
    05 chevy duramax2500

    it's not the trailer it's every trailor I hook up to.. I'll get out my meter in the morning and chevy the voltage..

    There isn't a fuse for trailers under the hood is there?
    ABSOLUTELY! There is a fuse block under the hood, when you open the lid it will have a diagram on the underside of the lid showing you what fuse is what. My silverado blew the fuse for the trailer running lights in this under hood fuse block. The truck's running lights will work, but the trailer won't if the fuse is blown. They fuse the trailer running lights seperate from the trucks, so if you have a bad connection or ground the connector out, it will blow the trailer running light fuse, but the truck will be fine. I dont remember how they abbreviated the name of the fuse, i think the diagram calls it out though. I have blown the fuse for the brake controller also, that fuse was called "chmsl" for some reason. I'm pretty much 100% thats your issue. If it's not clear which fuse it is, ill look at my tahoe (sold my silverado already) and the under hood fuse box is the same, ill look it up for you in the morning.
    I am on a drug. Its called Charlie Sheen. Its not available because if you try it, you will die. Your face will melt off, and your children will weep over your exploded body.



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