On a 66 GTO whenever you activate your turn signals you add voltage on the bright side to a total of four #1157 light-bulbs.
One in the front grill and 3 (each side) in the tail lamp panel. That current draw alone is enough to deflect most any amp gauge. Different brands of Amp gauges may have a variation of sensitivity but there may no problem at all with your car.
Try this: Key on; engine running, no turn signals but touch your brake pedal down at least 1 & 1/2". Now you are adding 12 volts battery + to six #1157 light bulbs. (That is assuming all six bulbs are working.) See what your amp gauge shows you then.
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Peter Serio
Owner, Precision Pontiac
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