I should have noted in my initial post that maybe once out of fifty times I check it, it seems to work. I looked at the fuses, and although I cannot say that I was completely familiar with that type of fuse, they appeared to be okay in comparison to the spares in the fuse box. Are the relays in the sealed black enclosure immediately behind the fuse box? It looks to have 3-4 screws holding it closed. If not, where are the relays? I ordered a used relay from SilverStarRecycling for $35 (better than the $145 quoted from the dealer), hoping that it would do the trick.
If anyone has any other suggestions, I am all ears.