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2007 GMC Yukon - Page 6 Questions & Answers
Why do my headlights brightning and dimming 2007 yukon?
Headlights dimming and brightening indicate a change in output voltage from alternator, not a problem as long as its within certain guidelines, usually 12.4volts - 13.6 volts (approx) . Overcharging alternators will produce a rotten egg odour from battery as it dries out. Put a voltage metre on the enging at idle and check upper range .
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