replace line to blower relay with 10 gauge wire and mount an in line 30 amp circuit breaker, one that plugs into an in line newer fuse holder or a breaker that can be screwed to the firewall. The current glass fuses are subject to heat failure when located at the alternator. On mine, the metal ends where the glass is will melt and break continuity, rather than the fuse element breaking in the middle. This fix is not factory, but it is not subject to heat stress, and if the circuit breaker pops, it will thermally reset and close once it cools off. So no fuses to replace. Changing the blower switch will not affect this circuit unless your problem was the relay did not engage, which is not the case based on you changing fuses and you are good to go.
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