We have been able to use the 3 mode cannons with an external flasher but I've never used a whelen flasher with it. We had it on a slow pattern and it worked fine.
That being said for what it sounds like you want, you won't need an external flasher or dummy device. Most dummy devices arn't cheaper than the normal ones anyways (or at least they are moving that direction price wise now).
Sorry for dredging up an old thread, but this comment, above, confused me. It seems like most of the time you all say the Cannons do not like to play with external flashers, but here you mentioned that they *have* successfully worked with some flasher, (pre-dating the new Feniex-brand external unit, which appears to offer only the too-fast patterns already programmed into the Cannon). Can the three-mode Cannon360 be set to steady-burn, be hooked to another manufacturer's flasher -ERM, Whelen, ShoMe, etc- and be made to sync with other lights that are also connected to that flasher? If so, may I ask which flashers will work on a pattern -maybe a double-or triple slow flash?- slower than Feniex seems to offer on their products, please.
I would like to add to, not replace, my OEM taillights with Cannons, as supplemental S/T/T lights available in bad weather -fog, heavy rain- like some European cars have, where a flip of a dashboard switch turns on brighter S/T/T lighting. I would also like to sync them with a pair of MicroPulse 12s on the deck, everything flashing simultaneously. Can this be done, and if so, which flasher(s) will work?
Thanks very much for clarifying this for me, and for any advice you can offer on how to make this set-up work.