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OK, if the left turn signal light flashes on the trailer when you hook it up I would pretty much think it has to be the bulbs or sockets are bad in your truck. I'd put a new bulb in and seee what happens before anything else. If no help, pull one of the bulbs and put a test light in there and see if it flashes.

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โˆ™ 2006-09-13 21:29:46
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Q: 2002 avalanche the left turn signals dont work the indicator in side flashes but the front and rear lights dont I have checked the bulbs they are OK when I hook up a trailer the trailer lights work?
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