Jacob's brake problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brookshire36, Apr 28, 2020.

  1. Brookshire36

    Brookshire36 Bobtail Member

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    Apr 28, 2020
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    I have a cat c12, and my Jacob's brake worked before I had my heat and air worked on behind the dash, my wiring has 3 wires blue, yellow and green in loom from brake switch, through the firewall to motor, none have power to.them with test light, relay is in fuse box but nothing to attach it to on back side of box, and no wires connecting to my clutch switch, any help.would be appreciated thanks
     
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  3. Chubby Fly

    Chubby Fly Medium Load Member

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    Nov 25, 2019
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    What year is this truck? And make and model
     
  4. Brookshire36

    Brookshire36 Bobtail Member

    18
    2
    Apr 28, 2020
    0
    2002 Ford sterling it used to have the Mercedes motor in it swapped it out for the cat c12 motor, if not mistaken the Jake switch has 4 prongs and only 3 wires are hooked to it , green, yellow and blue, wonder if that 4 prong was a hot qire for switch
     
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