I bought a 93 W350 w/automatic trans last year with 52k miles and started to restore it. Truck ran great. I let the truck sit for 8 months and now it doesn't start. I have no spark from the coil. When I turn the key on I hear the fuel pump and the fuel rail relay click. Also 2 of the relays on the fender well click twice as if they energized then denergized. I read that the ASD relay has been an issue for no start condition. I would like to replace it. I have 3 relays on the drivers side fender well. Is one of these the ASD relay? The numbers on them starting with the one closest to the fire wall are 0623, 0032, and 0043. They look to be OEM. Also, I always had to start in neutral. It would not crank in park. Also the ecm codes are 12,45,33,37,55.

 

OK, When I turn the key on I have voltage going to the coil for a few seconds. Then it drops to zero. ANYONE...........

 

Sounds like the shift linkage needs adjusting if it would only start in neutral.
Try running the shiit level from park all the way down to low and then back to neutral or park and see if it starts.

Dave