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No Trailer Running Lights

Discussion in 'Towing' started by couldbriding, Jun 21, 2011.

  1. Jun 21, 2011 at 5:42 PM
    #1
    couldbriding

    couldbriding [OP] Well-Known Member

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    When I connect my travel trailer to the Tacoma, I get brake, and turn signals but no running lights. All my lights on the the truck work fine. I have connected a friends Titan to the trailer and all the trailer lights work. Recently I added a P3 brake controller and I relocated the trailer plug to my bumper. I checked the fuses by the battery and they all are fine. I rechecked my wiring and it is correct. I am running out of ideas. Are there any fuses I am missing? Thank you for your help!
     
  2. Jun 21, 2011 at 5:53 PM
    #2
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Either the bulbs are toast, you have a wire fault, or no ground.
    Check for 12 vdc at the bulb.
     
  3. Jun 21, 2011 at 6:07 PM
    #3
    couldbriding

    couldbriding [OP] Well-Known Member

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    There are no problems with the trailer lights, it is a problem with the truck. Are there inline fuses on the second gen trucks?
     
  4. Jun 21, 2011 at 6:13 PM
    #4
    chugchug

    chugchug Well-Known Member

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    Try the other fuse box. It is behind the pocket door above the ebrake or the clutch like mine.
     
  5. Jun 21, 2011 at 6:27 PM
    #5
    couldbriding

    couldbriding [OP] Well-Known Member

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    just checked, all the fuses in the pocket under the steering wheel are ok...
     
  6. Jun 21, 2011 at 6:36 PM
    #6
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Ok, misread your post.

    Do you have 12v on the running light's pin, and ground at the truck's plug?
     
  7. Jun 21, 2011 at 6:36 PM
    #7
    chugchug

    chugchug Well-Known Member

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    Ok lets see we have tail lights on the truck but not the trail. So if you have a test light check the inside of the plug just ground the tester and start touching the prongs if you dont have power try the wires behind it if you have power you will have to take apart the plug and check the wires for connection sometimes they come loose. if the wire does work just keep tacking back until you get power.

    make sure you have a ground by testing the turn lights

    this would be easier by phone
     
  8. Jun 21, 2011 at 6:40 PM
    #8
    paintdiddy

    paintdiddy Machine gun shits

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    Relay under hood?????I just installed a wire harness on my pontiac and had to install 2 fuses and 2 relays under hood
     
  9. Jun 21, 2011 at 6:54 PM
    #9
    couldbriding

    couldbriding [OP] Well-Known Member

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    I know there is a relay in the fuse box behind the battery relating to the trailer, how do I test if this is ok? I do not have a test lamp or a voltmeter, but may be able to get one tomorrow. I know the wires in the trailer plug are installed correctly and not loose b/c I tore them apart tonight.
     
  10. Jun 21, 2011 at 6:54 PM
    #10
    couldbriding

    couldbriding [OP] Well-Known Member

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    Also, the trailer's turn signals and flashers work as well as brake lights so I don't think it is a ground problem at the plug.
     
  11. Jun 21, 2011 at 6:56 PM
    #11
    chugchug

    chugchug Well-Known Member

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    is it factory or after market
     
  12. Jun 21, 2011 at 6:57 PM
    #12
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    swap relays with another identical relay.
     
  13. Jun 21, 2011 at 6:59 PM
    #13
    couldbriding

    couldbriding [OP] Well-Known Member

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    Factory tow package, Ill go out and swap a relay...
     
  14. Jun 21, 2011 at 7:06 PM
    #14
    chugchug

    chugchug Well-Known Member

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    Well not sure what else to say but its in either fuses, relays, or just as little as bushing the prongs a little to make sure you have good contact.

    Good Luck
     
  15. Jun 21, 2011 at 7:10 PM
    #15
    couldbriding

    couldbriding [OP] Well-Known Member

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    the 12v towing relay in the box under the hood is ok. I swapped it out and still have no running lights on the trailer
     
  16. Jun 21, 2011 at 7:12 PM
    #16
    couldbriding

    couldbriding [OP] Well-Known Member

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    I hate electrical problems... I am not sure what else to do. I will try the voltmeter tomorrow and if I still can't find it, i guess i will let the shop take a look. I really need this fixed so I can tow the trailer for the 4th of July.
     
  17. Jun 21, 2011 at 7:25 PM
    #17
    TacoManJay

    TacoManJay Well-Known Member

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    I've been having this same problem since I got my 09. It's got the factory tow package and I get turn/brake but no run lights. I've checked all the fuses and I'm ready to go nuts. The dealership told me that everything checked out ok. I've just not been towing my trailer after dark. It's a major inconvenience. I'll be sub'd to hopefully find a solution.

    Is your trailer a 4-flat plug?
     
  18. Jun 22, 2011 at 4:01 AM
    #18
    couldbriding

    couldbriding [OP] Well-Known Member

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    No my trailer has brakes and uses the rv 7 plug.
     
  19. Mar 12, 2015 at 11:44 AM
    #19
    Deckplate

    Deckplate Well-Known Member

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    I'm jumpin on this thread. All lights on my trailer work except the running lights. Turn signals work, brake lights work, hazards work, and even trailer brake works. Its not my trailer because it was found at Uhaul trying to rent one of theirs.

    I have a '09 Sport with factor towing package (7 pin connector). Help.
     
  20. Mar 12, 2015 at 12:05 PM
    #20
    Clearwater Bill

    Clearwater Bill Retire from work, but not from life.

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    Does the pin that is for running lights, truck side, show 12v on a DVM?

    If you apply 12v directly (from another source) to the trailer side pin, do the lights work?

    If yes to both, the problem is in the connection, likely on the trailer side.

    If the answer to one is no, then that has to be resolved first, then retested, as there could be multiple issues.
     
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