First, check the fuse, if it's OK, then....
Turn on your 4-way flasher and find that flasher by following the noise and feel it for clicking. That's not the one you want.
There are two flashers under the dash, both look alike. Find the other flasher and install a new one. Seems they change the location from car to car, so you'll just have to keep looking 'til you find it.
Good luck!
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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