I'm working with a STEWART & STEVENSON LMTV and the thing will not crank. I've tried everything I can think of. The driver got fuel and said the lights were flashing when wipers would run and after filling up there was a hard start. It hasn't started since... The truck has been hooked up to Dr. Diesel, dash is all apart, tapped on starter????? The starter is getting power, but will not turn over. Anyone with any ideas please share.