Good news for me. I found the problem today. It was a pinched wire in the deadman proximity switch at the control handle along with the fact the switch was out of adjustment. I don't know how they managed to pinch the wire where they did (in a protected area) but it did come from a government agency, nuf said. The wire was broken but was still making some contact, probably just enough to complete the circuit but not enough for the switch to operate correctly. I repaired the wire and adjusted the switch and everything worked fine. I ordered a new switch (was in stock locally) and will replace the repaired switch. With only 14 hours the boss wants this truck to be perfect when sold. Thanks to all for the help.