I have the march pulleys and notice the dim lights and low charge at idle, but I have never had a problem starting the car or had to replace a battery or alternator because of the pulleys.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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