Buick Repair Questions? Ask a Mechanic for Answers ASAP
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the first thing I would do is check the bulbs. you may have a shorted bulb or incorrect bulb in one of the sockets causing a feedback in the turn signal circuit. look at the sockets as well for any corrosion.
start there and make sure all this is good before we continue
does that include the front lights???
sounds like you have sockets that are corroded