Neither forward or reverse contactors operate. Hydraulics and steering work normal. Checked cables, dead man, forward and reverse switches and current to switches is good. Changed complete SCR panel and card. No code. Could the truck be picking up a short from battery acid from battery and shutting down before controls are operated. Had that happen on a Crown 15sp48TT which put the truck out of sequence. Was hard to find. Any help would be greatly appreciated. THANKS