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Voltmeter needle registering upside down and leaks around top cab lights

(2008 GMC Sierra 2500 HD)
in Baton Rouge, LA on September 15, 2013
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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