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Dave Shepard

Big Cam 350/Jake Brake.

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Hopefully the last thread on this truck for a while. The Jake only works on low, and after it's used a couple of times, it stops working altogether. I know the switch at the PT pump is clicking, but have not verified that it is actually switching consistently. I know the clutch portion has been bypassed, and it keeps popping even at idle. I don't know much about them. Are there wiring diagrams available for a Jake Brake system based on the engine it's on? Thanks. 

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Older Jakes don't shut off at idle. Seems to be electrical connections are corroded. Usually the ones on the engine are the culprit, clean them up and it should work.

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The low-medium-high switch controls voltage to either one, two or all three heads to get the three different levels of braking. 

You can unplug wire right at the head and use a volt meter to see if things are working. 

Key on, engine off and a friend working switches with you on the meter should be able to track down your issues pretty easily. 

Good luck. 

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Thank you. I'll check the connections this week. I talked to a friend yesterday, he says he's seen the 1-2-3 switches fail, also. 

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Jacobs has a website .  All of the install, parts and troubleshooting manuals I have ever needed are on there.  

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Thanks, I'll check it out. Haven't had time to look into the wiring yet. Truck has been running well in combat mode, so at least it's useable. Have to order a shutoff solenoid. 

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