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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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