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E7-400 Jake brake won’t work


Richie253
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You can pull the wire off the post at the head, and put a test light on the wire and ground it to the engine. no need to drive it or even run the engine, just turn the switch on and the light should light, with the key on.  you can run the engine if you like, and rev it up and let off and watch the light, if it lights on each post then the issue is likely under the valve cover...  jojo

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2 hours ago, Joey Mack said:

You can pull the wire off the post at the head, and put a test light on the wire and ground it to the engine. no need to drive it or even run the engine, just turn the switch on and the light should light, with the key on.  you can run the engine if you like, and rev it up and let off and watch the light, if it lights on each post then the issue is likely under the valve cover...  jojo

Do you have any pics of the wires etc there are only two wires coming out of the rocker covers

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  • 2 weeks later...

if you have an Ambach pump, they have a controller with a diode, I think on the firewall....  Did you run a hot wire with an aligator clip to the posts on the heads just to see if they work? Robert Bosch pumps have micro switches.... and no diode... (Glenn,) correct me if im wrong...

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