Thanks for the reply garland_m,
The battery was reconditioned by local battery vendor.
It did read half the battery volts to the frame, but it didn't matter if the battery was in or out of truck, same problem. found no grounds to frame.
Customer decided to sell it like it is. the motors are both rebuilt, the controller has a warranty with it from FSIP, fsip asked me to send controller back to do more checks on controller. I wanted to figure this out, but customer said no were selling it like it is.