Ok now I'm really stumped!!As of friday, the truck now currently dumps the brakes all the time now!!! I checked and there is no ground going to the coil.....If I ground the coil, everything would work.....We replaced the following with known good parts from another truck......Carriage wiring card....Ev100 Card.....interface card....F/R contactor....Checked for smooth movement of the travel pot.....Just finished checking the mast cables also...have come to a dead end...any info?