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  1. #1
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    257

    Default help with my trailers lighting?

    I just updated the lights on my tool trailer from older bulb style to led. My signals & brakes work but my. Driving lights don't at all. I tested the connection to the led and I'm getting power. Ok. Its three wires. White-ground. Red-blink&brake. & black-driving lights. I tested red & black by them selfs straight to the battery and they work but when wired on trailer Im not getting my driving lights. Any help is appreciated. Thanks
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
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  2. #2
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    Trailer light problems are usually bad earth.
    Run an earth as a test wire and see what happens.

    Ji
    Grip it and Rip it

  3. #3
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    257

    Default

    Did it. Didn't fix it.
    Last edited by eecervantes83; 11-27-2012 at 10:13 PM.
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  4. #4
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    So you have Pos and an earth to the LED and still no light?

    Ji
    Grip it and Rip it

  5. #5
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    257

    Default

    Letme explain while wired on the trailer. I get no driving lights. But. if I disconnect the brake&blinker wire my driving lights work. I've checked for a short & found non. ???
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  6. #6
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    Did you check at the car connector?
    When checked at the LED did you use a light bulb or a multi meter?

    Ji
    Grip it and Rip it

  7. #7
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    257

    Default

    Quote Originally Posted by Jigantor:296933
    Did you check at the car connector?
    When checked at the LED did you use a light bulb or a multi meter?

    Ji
    Checked with light probe. Have power up to the led.
    .
    Miller Bobcat 225NT onan
    Millermatic 211
    Spoolmate 100
    (Retapped to fit regular mig tips)
    Work better & less parts to stock.
    Miller 130xp
    T/A Dragster 85 (portability 11 pounds)
    Oxygen/Acetylene torch set 50'
    2. 4-1/2" grinders
    1. 9" grinder
    14" Makita chop saw
    1/2" Aircat impact gun 900#

  8. #8
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    LED is a diode.
    Diodes allow current to flow in only one direction.
    Is the positive lead connected correctly?
    Ji
    Grip it and Rip it

  9. #9
    Join Date
    Jul 2010
    Location
    Salem, NJ
    Posts
    275

    Default

    I have never heard of a 3 wire system, only a 4 wire system and I have owned over 8 trailers in my short 15 years. There is flat 4, round 4, round 5, now flat 5, round 6, round 7, soon round 8, air brakes. You need Ground, Blink, Brake, Running. No system that I have ever worked on can have blink and brake on the same wire because they would conflict each other.

    That is probably why the lights don't work when connected on the trailer, and why they do work when blink/brake are disconnected. You are having a conflict on the towing vehicle.
    Last edited by Country Metals; 11-28-2012 at 06:12 AM.

  10. #10
    Join Date
    Mar 2011
    Location
    st-eustache qc.canada
    Posts
    225

    Default 4 wires needed

    If you have what we have most of the time on american made trucks, the same bulb that is lit when braking and blinks when flashing, you absolutely need 4 wires wich on the connector are white, green,brown and yellow.

    I don't remember exactly wich is what but they are named: left flasher, right flasher, parking and GROUND.

    As said before 90%+ of the time ground is at fault, never trust the trailer body or coupling to carry ground, there is to be a good wire ground all the way to the bulbs.

    If the vehicle is equiped with a dedicated flasher bulb at the rear (yellow lens) then you need a signal converter from auto-part store.

    When the ground is bad flashing mode dims the park lites and all seem to work confusely.

    hope it helps, my .02

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