2004 right blinker not working all the time

My 2004 Chevy Tahoe Ls right blinker doesn’t work all the time. At times it will not come on and times it does come on it will stop. I have replaced the blinker switch and I still have the same problem. Any ideas.

The problem may be with the turn signal flasher module.

Tester

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Silly question but I presume you’ve checked the bulbs?