A coworker has a 92 4 door blazer, his power windows dont work at all, all the switches are dead, I replaced the 30a breaker and still nothing....Where exactly is the ground located so I dont have to unwrap any wires?

 

no one?

 

I'd first see if there is power and ground getting to the master switch. I'm not sure if a '92 would have everything run through the driver's door master switch or not, but if it does, then it could be a problem with the actual master switch.

On the ground, hopefully someone will chime in with the appropriate wiring diagram, otherwise, maybe it's time to get a manual...