2008 GMC Sierra 2500 HD Q&A

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

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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