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2012 pinnacle jake brake issues

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We just got two used 2012 pinnacle with mp8 and the m drive trans. Jake brake works great one one of them. The other not so much. The switches seem to be functional. One is on and off the other has latch auto and set. I don't no how those settings work but I've tried everything with them. Still no jake brake? Anyone know if there is a fuse or a relay I should be looking for??

Thanks for the help

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