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Why dimming headlights and interior lights?

With the engine idling and I turn 'on' the headlights and interior lights will come on normally, but will suddenly dim for no reason and then come back to normal. I did notice that the amp meter drops at the same time. In checking about for the potential culprits, there appears that my serpentine belt may have more slack than it should. suggestions?

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  • Ronald Gene Brooks Dec 13, 2012

    No. the proposed solution wasn't close as it did not address the dimming lights inside and outside the vehicle. The solution was the belt tensioner is failing and not providing sufficient tension on the serpentine belt to keep it tight and the alternator to function consistently. The problem was at the root of the electrical supply, not the end.

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The outside lights could possibly be dim because the bulbs are burning out. -----------------------------------------------------------------------------
Renault CAN Clip

Posted on Dec 11, 2012

  • Ronald Gene Brooks Dec 11, 2012

    what explains the fact that both headlights and interior lights dim simultaneously as the amp meter shows diminishing voltage output?

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