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Brake Light Wire

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by A5¢, Apr 1, 2018.

  1. Apr 1, 2018 #1
    A5¢

    A5¢ Medium Load Member

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    I have a 2004 387 Pete that I am wiring in an electric brake controller in order to pull small trailers. This will be my personal truck. Where would be the best place to connect the wire that goes from the controller to the tractor brake wire. It needs to be on the cold side of the brake light switch.
     
    A5¢, Apr 1, 2018
    A5¢, Apr 1, 2018
    #1
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  3. Apr 1, 2018 #2
    ClineER

    ClineER Light Load Member

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    The brake switch is behind the dash on a manifold. You can connect to the cold side for your brake signal. That is the same switch that turns on your brake lights.
     
    ClineER, Apr 1, 2018
    ClineER, Apr 1, 2018
    #2
    RET423 and A5¢ Thank this.
  4. Apr 1, 2018 #3
    Goodysnap

    Goodysnap Road Train Member

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    I believe the 387 brake light switch is actually below the cab/sleeper on the driver side on the tractor protection valve.

    Since you are adding on. I personally would just add a air switch inline somewhere on a service line in the dash and fuse in fresh from an ignition power. This way you are not messing with factory wiring and potentially cause other issues.
     
    Goodysnap, Apr 1, 2018
    Goodysnap, Apr 1, 2018
    #3
    A5¢ and Justrucking2 Thank this.
  5. Apr 1, 2018 #4
    A5¢

    A5¢ Medium Load Member

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    I have had all the kick panels around the steering column off and even took all of the dashboard panels off. The only thing I found was the trailer parking brake light switch.
    The manifold had nothing electrical indicating an air pressure switch. It would appear that just putting in my own switch would be the best way to go.
    I do believe that I did find that the switch is under the cab/ sleeper. Nasty place to put it, but I guess that they had a reason.
    Thank you, gentleman for your help. I am one step closer to getting my retirement transportation dream come true .
     
    A5¢, Apr 1, 2018
    A5¢, Apr 1, 2018
    #4
    Tug Toy and Goodysnap Thank this.
  7. Apr 1, 2018 #5
    Jet A Fuel

    Jet A Fuel Bobtail Member

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    Dec 24, 2017
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    I did a simillar thing on my Freightliner m2 it works great.
     
    Jet A Fuel, Apr 1, 2018
    Jet A Fuel, Apr 1, 2018
    #5
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