All lights dim under heavy load or high RPM [Archive] - Toyota MR2 Message Board

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So, as of the last few days my lights have been dimming and voltage dropping when I give it the beans. Which is not uncommon when I drive. I only noticed this evening as I very rarely drive at night. Am I correct to assume that it could be my alternator brushes floating? How hard is it to change the brushes? Pull the regulator off and swap them out? Perhaps a slightly loose belt? It isn