OK I have watched youtube videos and read all kinds of feedback about a similar problem that I'm having with my 2001 Ford f350 7.3 diesel. I turn the key to first stage and I get lights, dash displays, radio, electric windows, etc but when I turn the key to start, everything goes dead. I have 2 new batteries, a new starter, a new starter relay. I've checked fuses. I've checked ground wires for the batteries. I have 12.53 volts on each battery. I have 12.53 volts on one post of starter relay but I have 0 volts on the other post when I try to start. It's a automatic and I've tried jiggling the shifter also. I also tried to jump it at the relay with a screwdriver but I just get a weak spark and click. I've cleaned the battery cables. I'm going camping in 3 days and I need this truck to pull the camper so I don't have much time. Thanks for any help.