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  1. Castle Bravo

    M915a1 Jake brake electrical problem

    Probably none of them do from the factory. There is a jake brake for a NHC-250 engine, but I don't think there is one for the 6CTA8.3 engine. One of the TMs contains mention and diagrams of an exhaust brake for the 939 trucks.
  2. Castle Bravo

    M915a1 Jake brake electrical problem

    This diagram is what I used when I troubleshot (troubleshooted? :)) mine. All of the wires you are interested will have a 52 number with a letter after it. In the diagram, the last letters designate the color of the wire. WH = white, GY = grey, etc. The high-med-low switch in the dash works...
  3. Castle Bravo

    M915a1 Jake brake electrical problem

    Page 2-62 of TM 9-2320-283-20-1 is what I used to troubleshoot mine. Page 2-63 has a logical diagram of the jake brake electrical system. It should tell you all you need to know.
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