couple days ago jumped in truck started it, ran for about 5 seconds then stopped. when I turned ignition key nothing happened. no crank, no click, no dash lights (engine check, etc) but I do have key on buzzer, interior lights etc. We smelled electrical burning just after the the engine died. Running throught the obvious, checked fuses, battery, starter motor/solenoid all good. Replaced ignition switch, still no start. Any ideas where to check? Especially the electric burn smell has me stumped, as I have probed under the dash and have found nothing burned.