Well, I've had a problem with my windshield wipers for a while now. They seem to work whenever they want to. Sometimes they work, and sometimes they don't. I know I should have fixed it immediately, but last night they decided to stop working on me as I was driving in HARD rain. I ended up running into a ditch. Although there wasn't too much damage, I realize it's very unsafe. The wiper fluid has never worked. Do you guys have any idea of what it could be? I was thinking/hoping it is the windshield wiper motor or something even cheaper. Please let me know any info you have.

You didn't mention a year for your truck but there is a recall for Blazer/Jimmy wiper systems that address your specific problem. A trip to the dealer and they might replace the defective motor for free.