My alternator has not been charging my battery as much lately. I do not know if this is due to the weather we are getting or what. Before, it used to be 14.5 . Then 13.5. With a/c, lights, and stereo on it's in the 12s. Am I actually losing some hp because of this?

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91 Formula 1LE 1 of 46
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 supercharger, Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5400rpm limit),Holley 9mm wires,Ac delco R43ts plugs,custom chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

Probably a little. One mag did a test at one time where they took the belt off the alternator to reduce the drag on the system for drag racing and they actually ran slower.