Power can come from the ignition switch, a switch to power the flasher or it could be wired so it is hot all the time. The out going side can go to a switch then the lights (turn signal switches are like that) or direct to the lights.
Some tractors on used one flashing warning light. A NAPA NF 552 (thermal type) is a two prong flasher that will flash 1 to 4 incandescent lamps (and there are others).
LED lights should have an electronic type flasher, not thermal, and some of those do require a ground, either via terminal or wire lead.
The third prong on some flashers is for the pilot (indicator) light, not ground.
So, all the info given has been correct depending on what is used. Best solution would be the correct manual with the wiring diagram and being sure you have the right flasher for the number and type of lamps to flash. It appears that should be AC# 70248109 which crosses to a 552 series mechanical flasher, to flash two incandescent bulbs.
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