I have a 1986 L2550 DT. It was running fine, I turned it off and went to start about a half hour later and it would not start. The lights would come on on the dash but the starter will not engage when the key is turned to the start position. When the key is returned to the on position no lights on the dash. They will come back on maybe in 15-20 mintues when i tried again. I replaced a bad battery, cleaned the cables and the ground lug where it attaches to the frame. I have good voltage to both the starter and the ignition switch. I have also checked the fuses and all are good.