Q: Turning brights on causes the engine to die

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I just purchased this used Yukon and I was looking it over in my driveway. I had it idling with the hood up when I noticed the left headlight was really dim. My uncle told me to turn the brights on and when I did the vehicle just died. It dies every time you turn the brights on. Doesn't matter if you push the lever forward or back.

My car has 160000 miles.
My car has an automatic transmission.

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