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Q: turn signal on 1991 Buick Regal

turn signal is not working even after changing the fuses and light bulbs
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the turn signal in the back is when i put the bulbs in they come on just dont blink i need to no where the sincer is
There should be a method of diagnosis to find the problem. A voltmeter and a wiring diagram can help to check voltages at specific points to try to isolate the root cause.
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