I've seen the flasher stop the signal from lighting up, and just cause it not to flash. Since it's been sitting, I have to wonder if a mouse has gotten in there and messed with your wiring though.
The flasher is located under the drivers side dash, and it should be relatively close to the back of the fuse panel. It's a small cylinder shaped object with a "L" shaped female two pronged connector attached to it. In stock location, it uses a small rectangular plastic piece at one end that allows you to turn it 1/2 a turn and lock it into a hole in one of the dash support beams. Most aftermarket ones just get stuffed up there in the wiring.
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