I found this somewhere on the interwebs, hope it helps you out!
"one of only two things...
the solenoid doesn't like you anymore, or the starter gear (bendix) can't stand ya either. (ok, loose/corroded/gunked up (technical term) connections might be a problem too)
Fix?
remove starter...
Connect jumper cable from ground side of battery to starter case. Connect one end of jumper cable to positive side of battery, and TOUCH the other end (red, please) to the large post on the starter.
This should fire the starter off, engaging the solenoid, throwing the bendix (starter gear).
IF it does (or doesn't), remove solenoid, emory cloth the cylinder looking piece of the solenoid and the hole it came out of, WD40 the begeebers out of the Bendix, reassemble, retest, If it all seems to work hunky dory, slather some grease on the bendix pay attention to get some on the drive "shaft" of the bendix (the part that slides) replace starter, fire up a cold one and try not to throw your shoulder out of joint patting your own back.
Polish/sandpaper/wirebrush/clean all the terminals while you're at it too.
If not a heck of a lot happens, take the whole sh-bang to a starter shop and have them test it, rebuild it, or buy a rebuilt one."
Cheers,
ollie
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