The diamater of the pullies are different. This is why the alternater might not charge fully, it will turn less than with the regular pulley. I had this problem at night with the lights and radio on. A local speed shop changed out the alt pulley and over drived it so it would fully charge. In short they turn your accessories less, which takes power.
Hope that helps
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1969 Mach 1 351C with a c6(for now)
Sold 92 Rag Top GT
Procharged & intercooled DSS 331 LC
Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.
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