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Help With A Jake


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Theres a dead short circuit somewhere between the dash switch & the jakes, or possibly internally in the jake brake. Try disconnecting the wire from 1 jake at a time & turn on the switch, see which one either does or does not blow the fuse, also try disconnecting wires from both jakes & turn on the switch, if the fuse still blows then the problem is in the wiring between the dash & the jakes or in the switch on the pump. If it turns out that 1 jake is shorted internally, pull that valve cover & check for a pinched wire in there between the jake spacer & the jake brake unit, if that checks out then the problem is in the jake unit itself. BTW, a jake brake should also have a switch on the clutch pedal to shut off the jake when the clutch is disengaged.

"If You Can't Shift It Smoothly, You Shouldn't Be Driving It"

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