Old trick - put a load on the electrical system by turning on the head lights with the high beams, radio etc then try sounding the horn - 99% of the time if the battery is near death, all electrical activity will stop when you hit the horn due to the high instant current draw. Also, how clean are all the battery connections and grounds?
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1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25
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