Chevrolet Pickup won't start

I have a 1980 silverado pickup 170,000+ miles that won't start. The battery is fine, lights and gauges still work. I can roll or tow start it and it runs fine. I took the starter off and had it tested at Napa and it still works. I crossed the larger and smaller terminal on the starter solenoid and it sparked and turned. I replaced the ignition switch even though there are hot wires at the ignition switch and still nothing. There are 9 wires at the ignition switch and I'm not sure where they all go to. I'm out of ideas and ready for help. Thanks