Get a volt meter check across battery terminal + and- See what the voltage reads . There are 6 cells in batt. 2.2 volts per cell so you should have 13.2 volts when not running give or take. Start car read voltage should be over 14 volts or so. If you don’t have a meter that have battery tester at harbor freight or go to auto parts store should be able to test you’re battery and alt
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