My right turn signal is not working sometimes. my left one works perfectly but when i want to use the right one it starts buzzing and i dont see the arrow working. Anything?

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1998 XLT V6 4.0 4x4 ext. cab
-dual exhaust
-spray on bed liner
-smoked lights
-tinted windows
-Kobalt Tool Box
-Pioneer Headunit & Kenwood Speakers