brothers8

Those are both excellent replies and I have considered both, The first reply, on /off switch. I need to do more fault finding on this. I have the panel open and have tested the switch. I need to do more testing to be sure of the outcome ,Thank you for the input. The second reply, Thats what happens, throttle on disables exhaust brake. The ECM has been replaced and I was thinking it was a reprogramming issue between TCM and the ECM? I have not seen evidence of a brake relay replacment but I need to trace relays on the pac brake for light signal ????????? Thank you for your time Guys Keep you posted...... PS In looking @ wiring diagrams on -pacbrakes site, non have brake lights tied to exhaust circuits? ..........

Thanks for the note on Bill Edwards, Im new to FMCA how do I contact him?

Hello Friends, My 1996 Safari,Cat 3126, AWT 6 Speed, pac brake activates every time you use the service brakes even if the pac brake is turned off. I disconnected the brake lights @ the momentary switch and all is well except no brake lights of course. Im having a hard time tracking there it is tied in, I have been using a pulse wire tracker but having little luck. Any one heard of this?