Richie253 Posted August 18, 2021 Share Posted August 18, 2021 I have a CHR 94 model with an E7-400 motor that I cannot get the jakes to work. When I check the relay that connects the engine brake control module to the dash switch and clutch switch all poles have power on them Quote Link to comment Share on other sites More sharing options...
fjh Posted August 18, 2021 Share Posted August 18, 2021 Does it get power to the heads when operated? Quote Link to comment Share on other sites More sharing options...
Richie253 Posted August 18, 2021 Author Share Posted August 18, 2021 I don’t think so Not sure?? I have taken it for a drive and they don’t even come on Quote Link to comment Share on other sites More sharing options...
fjh Posted August 18, 2021 Share Posted August 18, 2021 Ya need to check for power at the head it may not be an electrical issue Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 18, 2021 Share Posted August 18, 2021 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 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 18, 2021 Share Posted August 18, 2021 you can also use a jumper wire from a power source like the alt. pos. wire, and touch the post on the head and listen for a click sound, just to add to the diag... jojo Quote Link to comment Share on other sites More sharing options...
Richie253 Posted August 18, 2021 Author Share Posted August 18, 2021 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 Quote Link to comment Share on other sites More sharing options...
Jamkar Posted August 19, 2021 Share Posted August 19, 2021 That’s the wires that you need to check, One brake on each head (low and high). Quote Link to comment Share on other sites More sharing options...
Richie253 Posted August 19, 2021 Author Share Posted August 19, 2021 11 minutes ago, Jamkar said: That’s the wires that you need to check, One brake on each head (low and high). So is one earth and one power or both power? Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted August 19, 2021 Share Posted August 19, 2021 Both power Im pretty sure, grounds thru the motor Paul 1 Quote Link to comment Share on other sites More sharing options...
Richie253 Posted August 27, 2021 Author Share Posted August 27, 2021 Can I bypass the module and run power just through the dash switch, clutch and throttle position switches??? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 27, 2021 Share Posted August 27, 2021 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... Quote Link to comment Share on other sites More sharing options...
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