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Old 06-23-2025, 09:51 PM   #1
snowball
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Join Date: Apr 2012
Location: Texas
Posts: 135
Intermitent wiper always on

Hi all,

I have a 90 burb 5.7 r1500 and the wipers are alwyas on. I had to disconnect the wiper module to get it to stop.

I found a few on ebay and both I bought lasted for a day or 2 and then were always on.

What am i missing?

Thanks
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1990 suburban r1500 k 350 2wd
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Old 06-24-2025, 10:26 AM   #2
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,809
Re: Intermitent wiper always on

Very likely most 35 year old modules are failing the same way. Probably a bad capacitor that is part of the timing circuit. Take one of the dead ones apart and see if any capacitors are showing signs of leakage or bulging.

Also check for burn marks on the circuit board. Possible the wiper motor is drawing too much current. Enough to burn out the board, not enough to blow the fuse.
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