1998 ford expedition will not start all lights and radio operable checked battery, alternator and starter all operable

Check voltage in and out of ignition switch.

Sounds like you still have a bad starter. You can get a bad one from the parts store. Go back and have them test it. Or could be cylinoid.

check fusible link also check for power at starter first..make sure trigger wire is good at starter

Recharge the battery. Then after it is recharged it should start. Then have the alternator checked.

The alternator is bad. Sometimes the check does not reveal a bad rectifier inside the alternator and when you have a heavy load it will start failing so the light comes on.

have you checked the battery and alternator to make sure the battery is charged? and the alternator is charging? the clicking usually comes from a dead battery not being able to turn over the motor.

It could be the solinoid or relay to the starter also check connections to starter . Is there any sound (clicking) when you turn the key ? could also be in the ignition switch or transmission relay pick up a Haynes manual for that specific truck and it will show you how to check and the location of the relays

sounds like a possible answer

check your battery...this clicking is caused from insufficient voltage to the starter!!

check if you have power at the starter solnoid if so you may need a starter