wiring m3 mirror turn indicators

hi, obviously, i want them to blink in sync with blinkers - tried to wire into fuse box, but it only comes on -- a steady light -- when blinkers are on, it doesn't blink. the obvious option would be wiring all the way to the blinker itself, but that would be a pain, and there must me a lot closer somewhere that has the current already interrupted by the regulator or whateverchamacallit makes it blink.
thanks!!!

p.s. how do you attach pic to a thread?

you would either have to wire into the flasher for the factory turn signals, or get a seperate flasher for the mirrors. if you get a seperate one, they wont be synced up...