Q: The turn signal is working intermittently

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I have a 97 gmc sierra and every now and then I'll go to turn and get nothing the turn signal switch will go down for a left turn and stay there with no dash blinker lighting up, and no lights on the front or rear blinking but after the turn it clicks and flips back up. Is this a switch problem? I'll normally go out for 10 mins and then start working again when I select left or right the arrows on the dash blink slow and constantly when it's working.

My car has 235567 miles.
My car has a manual transmission.

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