I have a 1995 dodge van 2500 with an electrical proble, when I insert the key and turn it, the fuel pump relay does not click or come on. There is no voltage at the fuel pump relay. I have to wait at least 30 minutes with the ingnition switch on, then the relay stars clicking repeately, after a few minutes the relay stays still and there is steady voltage at the relay. After that I can turn the van on. I already replaced the relay and the ignition switch. What could be wrong?

I've seen this before, the problem is a bad computer (PCM). Usually if you first warm up the computer with a hairdryer, the engine will start almost immediately. That's the easiest way to verify that it's the computer.

I will definetely try the hair dryer, alloro. Thanks.

Heating up the PCM did not work, any other toughts? What else should I check?

Your problem is still the PCM. It just would've been nice to be able to verify it for your own piece of mind.