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Here's what I found last weekend on my non-A/C 71:
The brown wire to the switch is hot. If the switch is in one of the on positions, you should get continuity between that pole and at least one of the other poles.
The other poles lead to the resistor block, which you can get to by removing your glove box and unscrewing it from the plenum. That resistor is pretty easy to examine visually for defects. You should also be able to check it for continuity.
Don't forget to check the fuse panel (my problem). There should be a 25A fuse in the "A/C" socket that gives it power.
Brian
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