First thing to check is the terminals at the battery and make sure they're clean and tight. If it's not a sealed battery, check fluid level. How old is the battery? Evidently, the alternator is OK, else it probably wouldn't keep running. Take the battery and have a load check performed. It sounds like a shorted cell in the battery.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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