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Old May 1st, 2009, 07:29   #55
Veteran Member
Join Date: Aug 2007
Location: Chapin, South Carolina, USA

Look at the photos and captions near the end of the fan troubleshooting guide in post #1 of this thread. It covers the fan resistances.

Here is a copy of a photo caption:
"This is a shot of the drivers side fan connector. Note the spade connections. In this shot pin 1 is bottom, pin 2 middle, pin 3 top. These are 1/4" spades. The resistance on my good fan was 1-3 0.6 ohms, 1-2 0.8 ohms, 2-3 1.2 ohms."

You will have to be more specific on what you are asking for about the resistances on the internals. (And I would have to go and measure one.) The important internal resistances should be the same as those measured from the plug. You are essentially measuring:
pins 1-2 across the resistor.
pins 1-3 across the fan winding.
pins 2-3 across both the fan winding and resistor in series. (I know they do not quite add up, but that is life; not perfect but good enough.)

The resistances across the brushes should be on the order of 0.1 or 0.2 ohms.

Does that help?

DanG144 is offline   Reply With Quote
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