battery light comes on above 2500 rpm

2012 FORD F-250
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BHESSIAN
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1998 Ford Ranger 3.0 liter V6 130,000 miles. Battery light blinks on, lights dim and altmeter goes to discharge above 2500 rpm. Battery terminals have a bit of buildup on them ,though they were cleaned and painted 6 mos ago. suspect alternator diode. Any insight
Thanks
Feb 1, 2007 at 9:47 PM
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SERVICE WRITER
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I side with your insight. When yo get an alternater, be wary. I would go top end NAPA or USA brand myself. All alernaters are not equal.
Feb 2, 2007 at 5:42 AM