It looks to me that the compressor would not have to be on to drive the alt. but that is a poor setup. It puts a huge load on the compressor belt with only about a 1/3 of the pulley makeing contact. It will squeal & burn up belts.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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