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Get the battery load tested. A bad battery will quickly destroy a new alternator. Also check for a bad ground from the battery minus pole to the chassis and then to the transmission, then to the engine, then to the alternator body. Use a DVOM and measure resistance in the preceding steps to determine if any segment has greater than 0.001 ohms of resistance. Some techs like to use voltage drop as a test, I am partial to resistance readings. In the end they accomplish the same thing.

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Q: You changed alternator 3x this year what else could the problem be?
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