The one coming from the blower control module. Just unplug it from the blower motor and test it there. If the test light lights bright then you are looking at a bad blower. You can always hooke the blower up to the battery with jumper wires if you want to be sure. The blower control modules have three wires going in a power, a ground, and the signal that comes from the hvac module. The signal circuit is difficult to test and know what it should be, but between 1-6 is normal.
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