Just thought I would pass on a possible fix for repeated blower relay failure on late 70's Devilles. After looking through the posts on here I see that others are having this problem. The only fix I have seen so far is to replace the blower motor and/or carry spare relays which I have tried. My 77 Deville burns out relays on a daily basis so having spares has been expensive. My fix (so far) is to make up a harness to use 2 relays in parallel using 10 ga wire, the heavy wire acts as a heat sink. This has been working for 2 weeks now, much longer than any single relay has lasted. I do carry a fire extinguisher just in case!