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2018 Tundra with 4.6 engine trailer brake install

Discussion in 'Towing & Hauling' started by daemonjeep, May 16, 2018.

  1. May 16, 2018 at 6:15 AM
    #1
    daemonjeep

    daemonjeep [OP] New Member

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    New to this forum, and I dont own a Tundra, but I am an installer and thought some of you might like a little info on a possible location to help with a hardwire install of an aftermarket trailer brake controller. If you have a 4.6l V8 truck then factory electric brake is not standard equipment to my knowledge. A 5.7l truck it would be. Well, to help facilitate installation of an aftermarket controller, look in the passenger kick area of the A pillar post and look for a white plug that has 2 10-12 gauge wires, black and blue, along with multiple small gauge wires. The blue is the feed back to the 7 round, and the black is +12 volts. You can pick up the brake sense at the brake light switch, beige in color, and ground to chassis. Hope it helps......

    20180516_075729.jpg 20180516_075739.jpg
     
    NewImprovedRon and 15whtrd like this.
  2. Aug 23, 2018 at 5:04 AM
    #2
    alex1010

    alex1010 New Member

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    Thank You! for sharing and YES very useful!
    If you don't mind where would be best to tap into light switch?
    Thank You again!
     
  3. Aug 23, 2018 at 6:25 AM
    #3
    daemonjeep

    daemonjeep [OP] New Member

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    What exactly are you trying to hook up? I assume you mean headlamp switch? Are you trying to get marker lights or headlamps? Little more detail, maybe i can help.
     
  4. Aug 23, 2018 at 6:39 AM
    #4
    alex1010

    alex1010 New Member

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    Thank You!... I am about to install a Tekonsha Brake controller (my bad I should have said brake light switch above), I saw your pics regarding wire locations and found them extremely helpful!
    Passengers kick panel Blue = Feedback to 7 round
    Black = 12 volts
    I can ground on chassis
    BUT I was just wondering the easiest location to tap into the brake light switch wire to complete the installation. (2018 Tundra 4.6)
    Your pictures were extremely helpful and Thank You in advance for any advice
     
  5. Aug 23, 2018 at 6:55 AM
    #5
    daemonjeep

    daemonjeep [OP] New Member

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    Well as I mentioned in my original post, you should be able to find brake sense at the brake light switch above the brake pedal. I believe beige in color. Now here is the kicker. First verify that wire with a dvom not an incandescent test light. Second, some brake controllers if not all will have a slide switch on them to activate the trailer brakes independent of vehicle service brakes. This is to help with a jack knife situation and/or a trailer that gets to swaying uncontrollably. Now on some brake units, when this slide switch is applied the brake controller will output +12 volts on the brake sense wire. Not all, just some models. This is generally ok on older vehicles, but on newer ones you have to be cautious. Sometimes the vehicle brake switch is just a low current sense tied into BCM, where as BCM sees switch applied and itself turns on brake lights on vehicle. So you have to be careful and do some good research. Now I've only experienced one of these trucks so far, so my knowledge is still limited on them, so please do good research. Clear as mud? Hope it helps........
     
  6. Aug 23, 2018 at 7:34 AM
    #6
    alex1010

    alex1010 New Member

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    Wow! No crystal clear !
    Thank You so MUCH for your advise.
    Do you remember if that 2018 tundra 4.6 you did had 12v at the brake switch or was it just a continuity sensor to the BCM?
    I have the exact truck you installed that brake controller on
    Thank You !!
     
  7. Aug 23, 2018 at 8:22 AM
    #7
    daemonjeep

    daemonjeep [OP] New Member

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    Pretty sure it was +12volt. Just in case I would suggest some inline diode blocking on the brake sense lead.

    tundra brake light1.jpg tundra brake light2.jpg

    Heres some wiring schematics Pay close attention, this is for a 2018 with a 4.6. Either from August 2017 or before August 2017 production date notice the beige wire at the stop light switch.
     
  8. Aug 23, 2018 at 9:56 AM
    #8
    alex1010

    alex1010 New Member

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    Wow! Thank You Again!
    wealth of info here
     
  9. Aug 29, 2018 at 1:53 PM
    #9
    alex1010

    alex1010 New Member

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    Hello DaemonJeep,
    Just wanted to reach out and say Thank You again for taking the time to share those pics.
    I just finished installing my brake controller (Tekonsha P3) on my 2018 Tundra 4.6, your pics and advise saved me some headaches.
    Works like a charm and did a nice clean install.
    Thank You! again

    Alex
     
  10. Sep 21, 2018 at 2:34 AM
    #10
    miah190

    miah190 New Member

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    Hello guys,

    I'm assuming you just spliced into the brake sense, 12v power, and and feed back? I plan on using Scotchlock splices. I am waiting on the controller before I pull the kick panel out but from what I can see from above there is another connector attached to it from below. I am sure I am looking at the correct connector but the pic above shows the upper end of the connector and not the lower. I assume power is coming in on the black and the blue is headed out to the 7 round?

    Thanks
     
  11. Sep 21, 2018 at 6:22 AM
    #11
    alex1010

    alex1010 New Member

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    that is correct. works fantastic
     
  12. Sep 24, 2018 at 6:39 PM
    #12
    miah190

    miah190 New Member

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    Hello again,

    I got my Tekonsha P3 hooked up and everything is working but I noticed a couple of things. My brake lights do come on I apply the trailer brakes with the slider so I’m going to have to add a diode. Another thing is when I have the key on and the truck in park and when I hit the brakes I hear a click from the column. I believe it is the shift lockout and I don’t ever remember hearing it before. Granted I have only had the truck a few days and may have never hit the brake with the key on and it in park. Normally the key is off and I hit the brake and turn the key on to start then shift. When I do this there is no click from the column. Any ideas on this?

    Thanks,
     

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