TRAILER WIRING DIAGRAM 2004 CHEVY SILVERADO

Trailer Wiring: I Have a Friend with a Chevy Truck and His
2004 Chevy Silverado V8 Two Wheel Drive Automatic 103000 miles I am having problem with trailer lights. I have tried on 3 different trailers. So it isn't in the trailer. When I turn the left turn signal it works correctly. When I turn the right turn signal on both the right & left turn light blink. I have no left brake light.
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