SOURCE: Wipers fail intermittently
I own the same year and model truck, but haven't noticed that issue. I did own an '88 k2500 and had that problem. I know from my job experience that those particular trucks had an issue with the wiper motor ground path being faulty. You could check to make sure that the ground wire in the plug is actually "grounding", or the quick fix at least used to be, run a separate ground wire from the motor assembly to the body. There was also an issue with the control board on the motor, which I gather you've replaced. As I've mentioned I haven't encountered that issue with the later model trucks yet. Aside from the ground issue, it may be a faulty multifunction switch (turn signal lever/ wiper switch/ hazard switch assembly) I hope this helps.
SOURCE: Where is the windshield wiper delay circuit board
You are on the right track. If you have removed that little cap, and unbolted the nut what you do is pull and wiggle. There is a special tool, but if you are persistent you can do it without the tool. A little WD-40 never hurts either.
SOURCE: Sometimes my blazers wipers work fine. Other times
These systems use a module attatched to the front of the wiper module, screwed on by 3 torx head screws. The wiper motor is mounted to the firewall on the driver's side. Check with Cardone. They sell the module for about $35 plus shipping. This problem is very common for this system. Let me know if you need anything else.
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