could it be the ignition

Is there an embedded security system? Really hate to condemn the ignition switch, if it had been working find 'till then....there are some "mega-fuses" separate from the box, if there has been a dead short on any major components these may have fired off- I can pull up your schematic to see if there are these relays that control these major systems that either aren't getting any power or an enabling fuse has been blown-

let's study the path of the electricity-

the gauge panel-

somethin'

ok that was for your power windows- this one?

The ignition module and the ignition coil seem to come together in one block...assure this block is making good contact on all pins~

I'm going to call it...it is your ignition module at fault~

Buenas tardes me puede ayudar con el diagrama del conmutador combinado del C3500 año 1995,