power locks started switching back and forth

2006 CHEVROLET SILVERADO
14,000 MILES
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While towing a trailer load of wood today, we were going up a hill and the RPM';s reached a high 4000 and all of a sudden the power locks started switching back and forth, locking and unlocking themselves and the radio display started flashing the lights and words on it dim, bright, dim, bright. What would make it do that just now? Thank you. April
Dec 10, 2012 at 12:56 AM
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