test the battery with the key off, take a reading, should be 11.8ish, start the car and take another reading. if it's 14.x you're good. if it's 12.x you're alternator is on its last leg. if there is no change in voltage your alternator is burned out and needs to be replaced. do yourself a favor and buy a higher amperage unit and run larger cable from the alt + to the battery or dist. block. also upgrade the ground wire when you do this.
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