1993 FORD TAURUS WON"T START (SOLENOID??)

Make sure it is the solenoid and not something else. Get a voltmeter. Next time it won't start check the small wire that goes to the middle, small terminal of the solenoid. I believe it has a rubber boot over it and the wire is red with a light blue stripe. Take the wire off and hook up the voltmeter positive to the wire and the black wire to ground. Have someone turn the key to start position. You should get 12 volts dc. Do this test when the car doesn't want to start though. Also, you may have bad or dirty connections on the battery, starter solenoid and starter. Check and clean all of these connections. Also, disconnect the solenoid from where its mounted and check and clean that too. That's where it gets it's ground from. A new solenoid is about $35, and not hard to change. If you change it, make sure you get the wires put back on correctly.