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Q: Voltmeter needle registering upside down and leaks around top cab lights on 2008 GMC Sierra 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My voltmeter needle is no longer in the range of values on top(from 10 to 2 oclock) but registering now from 8 to 5 oclock. During heavy rain, water is coming in cab probably from the top running lights
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