When you say "click over", are you actually hearing a click from under the hood?
Automatic or manual tranny?
You could try testing the relay by bypassing the key switch and everything upstream. WARNING:
BE ABSOLUTELY CERTAIN
that the transmission is in NEUTRAL
before attempting this. Belt-and-suspenders, if the truck is a 4x4
with manual lever, shift the transfer case into neutral. Then put a jumper wire between the battery positive cable and the one "small" terminal on the relay. This simulates turning the key. If the starter turns, then the problem is upstream - key switch, clutch or neutral switch (depending on the tranny), wiring, etc. If not, then the relay is suspect.
Sorry about the bold, etc. above, but just a coupla weeks ago, a fellow down in the next town was diagnosing his truck, had it in gear, accidently jumped the starter relay, the truck started moving from the starter, and he pinned himself into his garage wall and was killed. 'Course, you've already been jumpering your relay, so you obviously know, but anytime I write such a suggestion, I consider it an obligation to include stern safety precautions.