alternator? Voltage regulator?

GMC YUKON
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MOMOF2RS
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Headlights, interior and dash lights (not radio and climate control lights) pulse. Alternator test shows OK, so does battery test.
2004 GMC Yukon 77,000miles
Sep 25, 2007 at 8:43 PM
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BMRFIXIT
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[quote:c3008702e1="momof2rs"]Headlights, interior and dash lights (not radio and climate control lights) pulse. Alternator test shows OK, so does battery test.
2004 GMC Yukon 77,000miles[/quote:c3008702e1]
check ground and check headlights switch+
scan your BCM or try to moniter data in and out the BCM
Sep 25, 2007 at 9:30 PM