x2 on the ignition switch.
My 98 did the same thing,it was the switch.I was able to back feed mine till i got a switch,just found a spot that wasn't getting power like it should.I hooked up a jumper and the engine started,kept the truck in business till i got a new switch.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews