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Trailer running lights aren’t getting power

Discussion in 'Towing & Hauling' started by JH5370, Nov 18, 2018.

  1. Nov 18, 2018 at 10:01 AM
    #1
    JH5370

    JH5370 [OP] Member

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    I only tow a couple times a year so it has taken me awhile to notice this issue. I was towing my in laws boat back from lake last week and I had no running lights. I have towed this boat before I have always had issues with the lights. I just figured it was the trailer. Today I hooked up to another trailer and confirmed my truck isn’t sending power to running lights through the 7 way plug. I haven’t tried the 4 way plug yet.

    How do I fix this? Will Toyota do anything about since it has never worked?
     
  2. Nov 18, 2018 at 10:34 AM
    #2
    Bumperjack

    Bumperjack New Member

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    Did you check the fuse?
     
  3. Nov 18, 2018 at 10:37 AM
    #3
    JH5370

    JH5370 [OP] Member

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    I did not because all the other lights work. Brake, signal, flashers.
     
  4. Nov 18, 2018 at 10:38 AM
    #4
    Bumperjack

    Bumperjack New Member

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    Boat trailer could have a bad circuit which could blow the fuse to protect the truck I want to find the fuse map for this truck to see which one it is
     
    JH5370 [OP] likes this.
  5. Nov 18, 2018 at 10:42 AM
    #5
    Bumperjack

    Bumperjack New Member

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    your truck light should be protected from trailer lights so that would explain why your other lights are good my old truck had towing fuses in power dist box under hood
     
  6. Nov 18, 2018 at 10:48 AM
    #6
    Bumperjack

    Bumperjack New Member

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    under hood fuse 6 Tow Tail would be the fuse for your trailer tow lights
     
    landphil likes this.
  7. Nov 18, 2018 at 10:49 AM
    #7
    SgtSausage1978

    SgtSausage1978 New Member

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    definitely the fuse i had the same issue .. check owners manual for which one .. they provide an extra one in there to use
     
    JH5370 [OP] likes this.
  8. Nov 18, 2018 at 10:49 AM
    #8
    JH5370

    JH5370 [OP] Member

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    The trailer lights work just not the running lights. Same story on two separate trailers. I will check fuses
     
  9. Nov 18, 2018 at 10:50 AM
    #9
    JH5370

    JH5370 [OP] Member

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    Is there a separate fuse for just the running lights?
     
  10. Nov 18, 2018 at 10:54 AM
    #10
    Bumperjack

    Bumperjack New Member

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    on the trailer yes
     
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  11. Nov 18, 2018 at 11:02 AM
    #11
    Rob371

    Rob371 New Member

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    Just google the diagram for a 7 pin and use test light to check truck. Not complicated.
     
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  12. Nov 18, 2018 at 12:32 PM
    #12
    Bumperjack

    Bumperjack New Member

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    Went and looked at my truck no fuse for Tow Tail I have a blue circuit breaker so testing at the 7 pin is the way to go
     
    JH5370 [OP] likes this.
  13. Nov 27, 2018 at 8:32 PM
    #13
    voodootundra

    voodootundra New Member

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    any update on this? Same issue here 2013 toyota tundra base
    I have proven its my truck with a friend plugging into my trailer and running lights work.
    I have break, hazards and blinkers nothing else.
    Checked fuses
    even went and bought another 4/7 and the same thing.
    so its from the for prong adaptor to the battery but cant find the issue.

    Please Help

    Vinny
    Tucson, AZ
     
  14. Nov 27, 2018 at 9:12 PM
    #14
    TundraTex

    TundraTex Get your FRAC on!

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    From the diagrams I have, it looks like the tail lights (not brakes or flashers) are tied to the same pin as the marker lights (Pin 2 - Brown Wire). Are your tail lights off as well as your markers? This circuit is powered by the 30A TOW TAIL fuse in the engine bay (battery) fuse box. The fuse feeds the TOW TAIL relay which feeds Pin 2 of the trailer connector. The ECU energizes this relay when the parking lights or headlights are on.

    I'd check the fuse and the relay. By the way the other lights and flashers are powered by different circuits than the marker/tail lights. So I'd definitely check the fuse.
    TowTail Fuse.jpg
     
    Last edited: Nov 27, 2018
    ColoradoTJ likes this.
  15. Nov 27, 2018 at 9:33 PM
    #15
    TundraTex

    TundraTex Get your FRAC on!

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    There are no circuit breakers in this vehicle. The blue rectangular item is a relay. You should also have a 30A TOW TAIL Fuse.
     
    ColoradoTJ likes this.

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