First the wiper moter was slow, with a groaning sound, the intermittant quit. would only wipe in fast speed then it quit altogether, also a clicking sound was heard during all this time.
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Sounds like your intermittent wiper circuit is defective. Normally the intermittent feature is engaged by one of the functions on the multi-function switch (usually on the steering column). The circuit of the intermittent wiper periodically activates a relay that closes across the "Wiper On" switch. Your intermittent wiper circuit is likely defective and holding its relay closed (or the relay is stuck closed), thereby keeping the wipers on. Note: The wiper motor has an internal switch that opens when the wipers are in the park position and that is designerd to stop the wipers in the park position. When you turn on the wipers (or the intermittent relay is closed), the motor's internal switch is shunted such that the wiper does not stop at the park point of the cycle.
The common way of controlling wiper speed is to use a 'tapped' resistor that supplies reduced voltage to the wiper motor on all but the fast setting.
They have to dissipate a good bit of heat and are subject to failure; I think yours has done that.
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