Have you tried the tech tip
http://www.stovebolt.com/techtips/turn_signal.htm

there is a section called
"WHAT IF I CAN'T FIND A WIRING DIAGRAM?"
You make a chart and use a meter.

thats what I had to do for a switch I had with no diagram
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=711927

Good Luck