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mine used to do that...but then out of nowhere, they just started working. so would the A/C, hazard flashers, alternator field connector, etc.... it seems that loose electrical connections are a common culprit in these cars.
the first thing I'd check is the harness going back to the switch. it's not hard - sometimes you can pop the switch out with a screwdriver, other times you might have to take off the dash panel.
check the connector end and make sure it's on tight. make sure none of the prongs are bent and that there is no corrosion. it wouldn't hurt to take some electrical contact cleaner to it....
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