[77newell]

Jimmy: I'll get back here later today with more details but the short answer is that if turning off the Jake switch caused the symptoms to go away the problem is likely related to the buffer switch on the side of the governor. Current should not flow beyond that switch at idle or when the throttle is calling for power. As long as you are OK without the Jake for today I wouldn't worry. Do not operate the Jake if it is running as you said at idle as this could hurt the engine if done for long periods and with more throttle.