Re: 99 Regal antilock break light on, left signal kills engine
Welcome to AF.
From what you describe, I would say the battery is the culprit. There is no reason other than a bad battery for it to lose 25% charge on one start up. I would also check the charging system to be sure voltage is at 13.8-16.2 volts while running to ensure the electrical system is charging the battery before digging into the ignition switch.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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