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Redbull876

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    I love macks

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  1. So the computer has to be program by mack for jake brakes to operate?
  2. Call you're local mack dealer I know they can increase it 50hp with computer program.
  3. There is a clutch pedal switch but it might be for the cruise control or might be for both idk. None of the wires in console is marked. It's an electrical fuel injection engine
  4. I have 1999 rb688s e7 350hp EFI, any how I bought jake brakes for it and installed it now my problem is wiring it in to truck. This truck never came with jake brakes but I found what I think is jake brake connectors under the hood and they plug on the jake brakes plug connector. My big question, is This truck wired for jake brakes even though it never had jake brakes? I tried finding connectors for jake brakes switches under dashboard but none of my wires or connectors is labeled. Is there a way of testing connectors? I don't know because I believe it goes through the engine computer. (New to this jake brakes thing) Anyone has any ideas it would be much appreciated. Thanks in advance.
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