2000 Sterling Jakes not working

[JTWAT]

Removed valve covers and operated jake solenoid,it wll activate. Ran 12v to solenoid and it works. Adjusted all valves, injector preload and jakes. Have power at jake on-off switch.
Cruise control does not work. Not sure where else to look for cause of problem.
The truck is a 2000 Sterling LT9500 with Cat C10 and 8ll trans..

 

[funwithfuel]

Check fuse for cruise. I would suspect it enables a second brake switch which disables cruise and enables retarders. Whether it's an air switch or a plunger switch on the pedal, I can't say.

 

[92U 3406]

I'd check clutch switch. If that is not the issue, I'd get a laptop on it and verify the throttle pedal goes to 0% when released.

 

[Tyler d4c]

Our sterling would do this till you turned the key off then we realized if you hit the cruze switch by mistake they don't work

 

[JTWAT]

Thanks Tyler, Ill try that. I also looked for a switch on the clutch pedal and linkage but found none. Accelerator pedal does not have one either. it only has a plug with wires going to ECM.

 

[Tyler d4c]

Thanks Tyler, Ill try that. I also looked for a switch on the clutch pedal and linkage but found none. Accelerator pedal does not have one either. it only has a plug with wires going to ECM.

Even if that isn't your problem maybe the switch is stuck in the steering wheel of something along those lines