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Gene1949 · 04-21-2021, 07:02 AM

Couple of thoughts on what I did;
(1) figured total amperage load
(2) sized the alternator accordingly
(3) used the smallest pully I could find on it

I too had a early GM (42 amp) alternator. When I added a late 90s Taurus SVO 2 speed fan and shroud (basically a bolt on), a 800watt stereo amp, halogen headlights and AC I had a huge deficit. Modified the GM mount to fit a later Ford 120? amp alternator and problem solved. The small GM pully I was using fit the late model Ford. Lot of different configurations of the Ford alternator, I forget which one fits (almost) the GM bracket I used on the Merc flatty.

04-21-2021, 07:02 AM	#5
Gene1949 Senior Member Join Date: Jun 2016 Location: Pahrump, NV Posts: 374	Re: charging question Couple of thoughts on what I did; (1) figured total amperage load (2) sized the alternator accordingly (3) used the smallest pully I could find on it I too had a early GM (42 amp) alternator. When I added a late 90s Taurus SVO 2 speed fan and shroud (basically a bolt on), a 800watt stereo amp, halogen headlights and AC I had a huge deficit. Modified the GM mount to fit a later Ford 120? amp alternator and problem solved. The small GM pully I was using fit the late model Ford. Lot of different configurations of the Ford alternator, I forget which one fits (almost) the GM bracket I used on the Merc flatty.