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Your alt is not charging the car.
Battery has nothing to do with it.
Do you have any underdrive pullies on the car? Not just the alt, but crank, wp, anything that would slow down the rotation of the alt?
My 87 still has a underdrive pulley on the crank, and at night the blinker is slow and guage drops down to 13 volts.
I would take it to a shop so they can put a load test on the alt with it in the car, not just the alt itself.
Is it better durring the day time, with no electrical equpment on or is it the same?
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2/20/2013: They Day the ****s Stopped
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