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Grab a voltmeter and disconnect the fan's electrical connector. Jump the voltmeter wires to the connector. With the ignition on accessories turn on the fan and you should receive a voltage reading on each of the four settings (only last two speed settings work on mine.....a bad connection in the speed selector relay prevents 1 and 2 from working.....lol). If you get a reading on at least one of the four settings replace the fan ($7 CDN from my local junkyard about 2 years ago...). If you do not get any voltage readings you should probably replace the speed selector relay; but you should check all wires anyhow.
P.S.: Search the forum for the link to the helms manual and the suplement; it has the wiring diagrams you're looking for.
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