It has no relay.
in the fuse box under the bonnet
If you haven't replaced the relay, check this website. It will show where it is located and how to replace. autorepair.about.com
Fuse or relay defective.
Ignition relay is probably shot. It is in the power distribution block in the motor comprtment.
it may not be you ignition relay, but your alternator.
It will be in the fuse block under the hood.
My ignition relay was damaged and it caused my starter to go out, which cause my car to shut down.
it's probably either the ignition relay or the fuel pump relay.
The starter relay is out. Or the ignition module. Or the ignition switch is out. And its the odds in that order. Greatest to least.
I believe they sit on top of each spark plug.
There is a relay between your ignition switch and the starter though. Check in the driver's side fender well above the fender skirting. You will find an inline relay.
That 92 GMC van doesn't have a relay for ignition. Power for the ignition is supplied from the ignition switch.