1998 Expedition - won't start

HELP!!!! Our expedition is driving us crazy. We have been towed home three times in the last week.

The truck intermittently refuses to start. It does not follow any set pattern. The truck does not need to be hot or cold it just suddenly refuses to start. When we try to start it and (it is refusing) there is one click and then silence. The dome lights dim. The windows and radio still work. We have had the battery, alternator, and starter checked. We replaced the starter becasue the test indicated it might be the problem. We were hopeful that the problem had been solved but ... we were left stranded again. After towing the car home it has started immediately two out of three times. Any ideas? Suggestions? HELP! Please! I'm driving my husband crazy with this truck!

I'm having the same problem. I'm begining to think the key needs to be replaced. It starts with my key(i think... haven't tested exhaustively), but not my wife's. I know these keys have some chip in them, and guess there must be someking of battery?

I had the same prob I replaceed the starter as well but come to find out it was a relay switch up were cabels go from the bat. out to the top part of the truck its a round black cilinder were the cabels hock up it cost 4 to6 bucks

my bad I got home and looked at the box it was the stater cylinoid I changed 4 months ago haven't had a prob sence