Depending on weather it has a cable or hyd. clutch it could be your slave cyld. is stuck or is low on oil. It is cable the linkage might be stuck or your cable is broken or out of adjustment.
The answer is subjective. My pick would be the Road King
It would require bearing swap. At least.
If I am not mistaken, all 2007 Harley Davidson's were fuel injected and would not have a carburetor.
The similarities would be a shorter list. A Fatboy is a Softail and a Road King is a Touring bike. The frame is completely different. If you are talking about 99-newer then the motor is even different (the Softails have solid mount balanced 'B' motors and touring bikes and Dynas have rubber mounted motors).
AC Compressor clutch relay may be stuck. Remove the relay and see if the clutch releases.
The primary oil does three things. Lube the clutch. Lube the primary chain . And cool the stator. If Harley thought Dextron would do this, they would have recommended the use of it. Keep your Harley a Harley.
The 185 had a live PTO in that the tractor's movement could be stopped with the PTO remaining engaged through the powerdirector clutch (this was the tractor's 2 speed, shift on the go, set up). However, if you pushed the foot clutch in, the PTO would lose power along with the forward motion of the tractor stopping. Also, the 185 was available with a hydraulically engaged PTO clutch, which would allow the PTO to be engaged while the tractor is moving, where the mechanically engaged PTO required the foot clutch be depressed, the tractor be brought to a stop, then the PTO engaged and the foot clutch reengaged. It was "live" per definition, but not "independent."
There may be some worn gears/bearings in the transmission, but more likely it's the aligning bushing in the clutch disk.
Misadjusted or bad clutch safety switch? Usually located at the upper end of the clutch pedal
With just that to go on I would say that your clutch release bearing is going bad especially if the noise quits when you put pressure on the clutch
Your turn signals may not be blinking properly because something may be wrong with the wiring or fuses. Take your Harley to an authorized dealer to have diagnostic testing done.
It's worn out, bad linkage or worn shift levers.