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I've been fooled once.
Posted by John Myers [Email] (more from John Myers) on Fri, 23 Mar 2012 15:59:51
In Reply to: Diagnosing Heater Fan vs. Heater Controller, Scott H., Fri, 23 Mar 2012 15:33:12
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The only way to be certain when the fan is not running at all or barely running is to use a long piece of wire and jump from the ground side of the 2 pin connector at the fan to a good ground. The fan should run at full speed.
The fan always has voltage applied and the controller varies the ground side. I once disconnected the plug and read 13.8 volts across the connector so I was sure the controller was ok. Oops. It was fine with no load, but it failed when it was connected. I had to take the fan motor back out and put the old one back in and then replace the controller.
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