Here's the "offending" part of the harness.
http://i122.photobucket.com/albums/o...2/100_1562.jpg
My 71 physically just has the wire to engage the compressor. This bit isn't there at all. As you can see, the 72 parts car had a jumper on one of the wire connectors, which leads me to believe it was a "low pressure cutoff" or some such thing.
Haven't had a chance to dive in any further. Everyone I know around here with 72 books is getting ready to head up to Nationals and I'm packing up parts to send there myself.
C.J.
And thanks for the welcome back, Blu.