I have an old clark here with a EV1 card in it.. 48VDC I have perfect forward function but in reverse I have a long delay before contactor coil picks up. I put positive lead on batt and neg lead on coil and I have a growing negative starts at 2 or 3 volts and slowly grows to 18vdc or so before the coil picks up the voltage keeps growing with time to battery voltage. Do I get negative from the card or the coil driver? Or card first then driver then coil... **** old junk. Hehehe.