1979 SD with evil servo. Last year I was having problems with the blower not working. Did a lot of testing, even replaced the amp but finally replaced the blower and all was fine. A similar problem has resurfaced.
Last year when the problems were occurring it was blowing the Air Conditioning fuse. (at the time I mistakenly thought it was blowing the blower fuse). Air conditioning fuse blew about 3 times recently, I replaced it each time and blower returned. Last time I put in a heavier fuse. That fuse is holding but now the blower does not work. It's not getting 12 volts. It will run if I deliver 12 volts directly to it from the battery.
What would stop the delivery of 12 volts to the blower and be somehow related to the blowing of the fuse for the whole climate control system?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13