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Q: Electrical power on my 1990 GMC Suburban on 1990 GMC Suburban 2500

My 1990 GMC suburban just quit while driving it. It lost electrical power and the only thing that works is the head lights. Is there a fuse or fuse link some where that has blown.
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This happened to my wife as well and while she was driving in her 94 Suburban. I had to replace the headlight and parking light switch on the left side of the steering wheel that turns the lights on and off. Her blinkers stopped working at the same time and I had to replace the hazard and turn signal flasher. All lights are now working.
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