Hello All, I took Jan's diagram and all your other helpful hints and checked all the relay contacts - the connectors were all in place and they all had the proper voltages. (that is, once I oriented it correctly as per Jan's instructions "below the socket"). I then went to check the connections on the fan itself. While everything looked fine, I removed and re-seated all the fan connectors, and voila - I had speed three back! Must have been some corrosion on the connectors, since it all works just great now. (I should have checked these first - Doh!) Tomorrow's project: remove hood and install new truck rubber weather seal. Any pointers or gotchas I should know about? Thanks to everyone for being so helpful, -Hank #1619