Do you have a VOM? If not get a cheap one on Amazon or Harbor Freight and check the voltage there. Connect the red meter lead to the White with black tracer and the black meter lead to the white if correct it should read + 12.? if it reads - 12.? then the white and white with black tracer are backwards. Start there and see what you get. Usually when the battery is connected backwards it just blows the fuse on the radio but it is pre owned so who knowes the original owner did. Let us know what you find.
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2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.
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