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You didn't mention what year nor the model of your bike. If the bike is later than a 1990 model, odds are that is does not have the old style "flasher" unit but rather the Turn Signal Microprocessor. If you have self-cancelling turn signals that you do not have to "press and hold" the turn signal switch on, you have the TSM. It's a "black box" that is about a half inch thick, by about three inches long and a inch and half or so wide. Where it's located is dependent on the year and model bike. Just keep looking is all I can tell you. Odds are that it's located under the seat or the dash on the tank.
That's because it doesn't use the old style flasher that cars and bikes of the past used to use. It has a Turn Signal Canceling Unit. It is a "black box" that is about a half in thick, and inch or so wide and about three inches long. There's a large plug on one end of it and a bolt hole in the middle. It's probably located under the tank on your FXR.
The Harley FXR Super Glide Also known as FXRS turned in to the Dyna Lowrider, Either way the proper term Is FXRS. Non the less, Harley service manuals during that time was not year by year like it is today. Here is an example of the exact manual you will need.
I'm not sure your '90 model FLT has a "flasher" as you might think. It may have the turn signal cancelling unit. The way to tell is if when you depress the turn signal switch and let it go, does the light continue to flash for about 15 seconds? If so, you have a turn signal cancelling module instead of the a conventional flasher unit. If when you let off on the switch, the light stops flashing immediately, you have the old style flasher. I can't remember when they changed to the module in all the different modules.
If it has a module, it's probably under the seat the tank. If it's a standard flasher, it's probably behind the headlight.
You are missing you rear turn signals. Yes there should be a flasher but it requires all lights to be working before it will flash. It needs the original loads on the system. If led sights are installed they should be accompanied by loads that fool the flasher into thinking that the original bulbs are still there.