2001 Ford Ranger clicks once then won't turn over, and when key is turned off, it begins making a clicking relay noise under the dash?

2001 Ford Ranger clicks once then won't turn over, and when key is turned off, it begins making a clicking relay noise under the dash?

Your battery is charged? I'd try putting it in neutral. There's switches behind the steering wheel, on the brake pedal.
Easiest first. Battery, starter solenoid, starter then safety switches.

With it being a clicking noise I suspect it is the starter relay.