Agree with above post. When it get hot it has more resistance, so with a bad alt, loose wire, ground, heat will make the problem worse. Get the alt checked, tell them the problem and have them put a load on it more than once, to heat up the alt.
2010 Shelby GT500, Kona Blue W silver stripes.
2007 Shelby GT500, Vista Blue with Tungston gray stripes, 1 of 119, Wifes car...
94 Cobra Pace car Convertible # 591
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2001 Cobra vert # 2001 SOLD