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Clean the ground connections, especially the engine ground to the radiator support (wire from valve cover bolt to support metal). Voltage fluctuations like that are not normal. You can test the grounds with a volt meter. Start at the battery negative terminal and touch the other lead to various ground points with the engine running. If you detect a voltage, anything above a very small amount there is resistance in that ground connection which could be your problem.
regards
Mech
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