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'03 E250, standard van with RKE if that's pertinent.............
Looking to replace the on-board 4-way flashing system with Whelen strobes and looking to have the column mounted button be the on/off switch for that power supply. I have a schematic from a '97 E250 (almost identical FWIW) which I can post the pin out, test procedure and EVTM version of the hazard portion of that Multi Function Switch if that's helpful.
I know it would be far, far less complicated to control the Whelen via a separate switch but this above reversible mod would be somewhat cool IMHO.
Sorry, you can't do it. The hazard button is part of the multi-function switch(the turnsignal switch). In other words, it's not a separate electrical button, it's just mechanical and pushes on the turnsignal switch and puts it in the hazard mode.