When the blower switch is put on max, the juice for the blower comes right off the charge output wire on the back of the alternator. The blower will get good input voltage, esp. from the high amp alternator. I used to have trouble with the blower fuse, which is right there, either blowing or frying. After a new blower motor and new fuse holder and the correct 30 amp fuse it works well. I also now run a 100amp alternator. I get belt squeal regularly from the increased load on the belt. I am going to go to a better, deep groove pulley and see if that helps.
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