I have been having trouble when setting and releasing my parking brake I lose anything from power window operation, ABSA light,speedometer no registring to the heater fannot running. Right know I have all four not working but the tach/oilpressure, battery etc works and the power locks work I have looked around the brake several times but haven't see anything obvious. Is there a module that may be affected here? Mabye a ground wire as it seems strange to effect those three thngs at once it usually figures it self out whe the truck is in a warm garage by setting and release the brake?Must be a wire rubbing somewhere...the onlt other thing I was thinking was the comand start....

Jason

 

There is a sw on the park brake pedal that puts on the lite. I think it must be hanging up and causing the anti skid controller to not put out a "run A22" signal. The anti skid would not work and neither would the blower motor "relay" even though 12v would be at the relay there is no trigger signal. The speedo signal also comes from the anti skid controller. Check the park brake sw.

 

that would make sense being this only happens in the winter... switch is colder and right now we are in a huge cold snap

Thanks at least it is easy to get to.

 

Check abs wiring at left rear spring and axle. Not sure would do all your problems though. Won't take long.