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Mend GMC Vandura 2500 Low High Switched

Why does one low beam headlight turn off when high beam is switched on?

I have a 1991 GMC Vandura 2500 and just replaced all four headlights. The low beam works on both sides, but when the high beam is selected, the low beam goes out on one side.

Jean Ann
October 2005
possible faulty earth strap to the bodywork causing a short

Rich Pickering
August 2008

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