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Old 07-08-2003, 06:48 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
If it's a resistor pack system, one wire sees ground, one wire sees some voltage. If it's an IC controller, one wire sees constant +12V, one wires sees close to +0V at max, close to +12V at min.

It threw me for a loop when I was diagnosing a blower motor problem and neither wire was a solid ground.

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