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2014 Brake controller harness no Power

Discussion in 'Towing & Hauling' started by Uncle Buck, Nov 26, 2015.

  1. Nov 26, 2015 at 5:35 PM
    #1
    Uncle Buck

    Uncle Buck [OP] New Member

    Joined:
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    First Name:
    Stan
    Vehicle:
    14 White Tundra Limited 4X4 Crewmax
    Just purchased Toyota harness # 3040P for Tekonsha P3 controller, when installed it would not power on. After checking the plug into the controller I found no 12V power in on the black wire, hooked to trailer have turn signals but no running lights. Can't find any blown fuses. Is this normal or am I missing something?



     
  2. Nov 27, 2015 at 6:57 AM
    #2
    Jack Burton

    Jack Burton New Member

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    Little China
    Vehicle:
    2013 DC 5.7L TRD/OR
    Tires, Diamondback HD Tonneau w/ ATV Carrier
    I had the same problem when I installed mine. It turned out to be a blown 30A fuse in the block under the hood. All the fuses inside the cab were fine.
     
  3. Nov 27, 2015 at 9:58 AM
    #3
    Uncle Buck

    Uncle Buck [OP] New Member

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    Male
    First Name:
    Stan
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    14 White Tundra Limited 4X4 Crewmax
    Thanks for the reply, I checked under the hood replaced the #11 30A fuse although it appeared OK, found a blown fuse, labeled tow tail, unit still not powering on. I'm beginning to think unit may be bad, however last time I used it on my 06
    tundra it was working fine.
     
  4. Nov 27, 2015 at 11:08 AM
    #4
    Jack Burton

    Jack Burton New Member

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    Little China
    Vehicle:
    2013 DC 5.7L TRD/OR
    Tires, Diamondback HD Tonneau w/ ATV Carrier
    Odd. I have no idea then. Sorry I can't be of more help.
     
  5. Sep 13, 2021 at 6:13 PM
    #5
    erkme73

    erkme73 New Member

    Joined:
    Sep 17, 2018
    Member:
    #19479
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    4
    Did you ever manage to get this resolved? I'm in exactly the same boat. The factory harness has 12V power (both fuses are good) but the pin with the power is on the thin green line, not the thick black line (as it is in my 07 Tundra).
     

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