On high the blower circuit bypasses the resistor (battery voltage to motor) and goes through stepped resistances through the resistor to obtain different speeds. How was the volume of air flow through your vents? A blower motor that draws alot of amperage usually is not working too good (extra resistance through motor) so it may draw alot of voltage. How much do your lights draw? Do you have pulleys? Do you ever have to jump start your car?
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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