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Q:

ground locations on 1993 Buick Roadmaster

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
instrument panel -loose conection speedometer odometer and voltage guage where are these common?
(1) Answer
You will need a wiring diagram to know for sure. You can find them online for some vehicles, if you can't find one, get a repair manual, either a book or try alldatadiy.com