Have a 2002 explorer that suddenly quit on me while driving ,replaced starter and ignition switch,ignition cylinder, relay and checked all fuses

Check the fuel pump. Could be electrical, something shorting out the system.

Meaning the engine will not spin when the key is turned? Then there is an electrical disruption between the battery and the starter or the key switch to the solenoid/relay. The net will have videos to check these systems. You will need a multimeter.

Tks,I will check them ,thought electrical myself, UST not where

Does the engine spin normally when you turn the key to the start position, but simply doesn't start? If it does, it's probably not the starting portion of the circuitry. What concerns me is the engine killed while driving. Did you check the voltage in the battery with a multi-meter? It should be 12 volts. If not 12 volts your battery could be bad or the alternator is not maintaining a charge on the battery.

Had battery checked good, only thing comes on is dash ,dome lights ,door chime ,it just won't crank over

OK, the engine does not spin when you turn the key to start. Visit this web site for a testing procedure. WWW.howcarswork.com/ignition-system/checking-a-starter- circuit Since the car killed while driving suspect a ground issue, expecially the engine ground strap. Dashboard lights etc may be grounded to the body where the starter system is usually grounded to the engine. If the engine ground fails the starter will not spin because there is no ground. Pay particular attention to the instructions for the starter system you have. I believe the solenoid is mounted to the starter itself. A smaller circular device attached to the starter itself. You'll need a multi-meter and adhere to the precautions listed.

Tks,oj I fixed it it was a burnt wire ,wire was on top of manifold fixed it and it started right up