Tom, Thanks for the info. The problem with this truck is that it looks like the 2 sets of six volt batteries that are in series, are hooked in parrallel to the truck. All I can get is 12 volts to any contact coil. There is no voltage value on the coils, ect. At this point the customer has a 12 volt charger, from another truck, and I have instructed him to charge up one half of his batteries at a time. Thanks, Ralph.