Swoop223 and Edward T. AND chevotaman. NEED HELP PLEASE. I have crown RC3020-30 / 1A287566. CARD number IC3645LXCD1 EV100. Problem FWD/REV contactors won't engage. TB1=3.97V, AT REST W/O THROTTLE.002 SO NOT SPEED POT. TB-2 unhooked 37v on wire and 37v on screw head. TB-3 BV. TB-4=BV. TB-5=FWD W/O THROTTLE 37-30-22-19V. JUMPS AROUND. SAME ON TB-6=REV. HAND SET SHOWED 47 CODE=2 REC DID NOT TURN ON CORRECTLY. I used the handy man for rec's1-2-5. all test ok sort of 2 and 5 the red light stayed on 10 sec's while i was holding down on leakage test. re tested and blinked on then off quickly. now hand held shows code 70= regen current sensor input missing? what is this (yellow wire).where is the yellow wire? also this unit has a motion alarm fwd/rev sounds a audible alarm backup alarm and it works i also checked brake switch. and i'm here switch. everything on this truck works except fwd and rev. i'm at a loss can ya'll please HELP.