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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

home Fix label Vehicles label_important Vans category GMCdone

possible faulty earth strap to the bodywork causing a short

Rich Pickering, August 2008

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home Fix label Vehicles label_important Vans category GMC

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

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

I can answer this question ...

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

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