Arthur,

When I check the archives with the correct key words, I do see that you have posted quite extensively on the blower regulator topic. My bad.

The results of my test with a voltmeter are as follows:

Red to Black 12v
Yellow to Black: low fan speed 1.25 v
mid fan speed 4.92v
high fan speed 7.61v

So all inside switches are good and the problem lies with the blower motor or blower regulator. The interesting thing is that when I accessed them before and pulled the red and blue wires off and then put them back on, the system worked fine before it went out today.

Is it typical behavior for a bad regulator to be an intermittent problem or do they tend to go all at once?