1993 Chevy Suburban starts sometimes.

My suburban starts just fine, sometimes. When it doesn't start, there is no clicking or engine attempting to start. I have replaced the starter and starter solenoid, the ignition module, and the fuel filter. When the truck is not starting I put a volt meter on the ignition wire on the solenoid, had a friend try to start it, but the volt meter read "0". This problem has become more and more frequently