instead of just buying parts and hoping that's the problem. why don't you find the trouble shooter flow chart, find out the real problem and fix it. highdesertranger
Ideally, that is the right way to solve a problem. Blindly changing parts gets expensive and nothing is learned about the system being repaired.
Problem is, sometimes these "shotgun repairs" work - especially when multiple parts are changed at once. I guess since bypassing the diagnostic procedure and jumping straight to part replacement is easier - it justifies the occasional hit to the wallet.
But, in this case, the proper diagnostic procedure was basically followed. The problems described were both specific to wiper circuits equipped with the delay option. The primary complaint was that the wiper motor would intermittently start - without any action on the part of the operator.
The diagnostic charts provided by GM for the windshield wiper circuits cover many issues. They offer possible causes/solutions for: the wipers not starting at all, operating only on high/low speed, running at the same speed - regardless of switch position, failure to return to park position, failure to shut off and mechanical problems like the motor runs but the arms don't move. They don't mention anything related to what the OP asked about.
They do discuss intermittent operation, but that only refers to the the wipers repeatedly starting/stopping
with the switch in a run position.
Point is; nowhere in the diagnostics does GM address the issue of the wipers operating independently of the operator on an intermittent basis.
Delayed wiper operation, wiring diagrams and diagnostics for 83-84 C/K series:
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Delay diagnostic:
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Delay diagnostic refers to this - standard wiper diagnostic:
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1986 delayed wiper wiring diagram and diagnostic:
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BTW - For jetman: I'm not sure of which model year the wiper switch was moved to the column, but I think it may have been in 1984. So, its possible that the module location, as shown above, doesn't apply to your 1983. If your switch is dash mounted, the delay module will be hardwired directly to the back of it. Like this:
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