Quote:
Originally Posted by 93chev6.5diesel
The actual column signal light/wiper switch? Or the pulse board on the wiper motor? I have the earlier pulse board which is no longer available as a possible repair.
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I know about the circuit board problems as I have a Lumina that had issues; and discovered as you did that there's zero aftermarket support for the circuit board. I had to buy an entire wiper motor with board from a salvage yard. All the wiper motors sold by parts stores as "rebuild" do not come with the circuit board.
If that's what your truck has...I'd be looking in the salvage yards.
Even so...it's worth your time to buy the service manual. I have this nagging feeling that there's a capacitor-and-charging-circuit in the turn signal stalk or in the steering column switch, and when the capacitor circuit fails, the intermittent wipers are affected. The rotation of the delay knob changes the rate that the capacitor is charged, when fully charged, it discharges into the wiper motor causing one swipe of the wipers. Then the capacitor is gradually re-charged at a rate dependent on the position of the knob.
OTOH, I haven't had to deal with this on my truck, and I might be way off-base.