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What engine does your 1998 Explorer have?
Have you checked for any trouble codes in the PCM (Engine Computer)?
DO you have a test light to do a few electrical tests?
Did you swap relays? What did you do at the relay box?
Does the check engine light go out when the engine is cranking?Does the theft light flash rapidly when you try to start it?
Ok. To do the electrical tests, I'll need to know what V6 engine your Explorer has. There were 2 V6 engines in the 1998 Explorer. The 4.0L OHV V6 and the 4.0L SOHC V6.