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It CAN be done with up fitter switches and the Rigid or Sho-me flasher type unit but there are better options. If you use this type of flasher and want constant on in addition to flashing it will consume 3 switches. Switch 1 will be constant on, switch 2 will be strobe and switch 3 will be strobe mode. You can wire it  by using simple T split and diodes that prevent switch competition OR a DPDT relay  (which will energize the flasher with ignition shortening flasher life) or 5 pin relay but you would have to find input side of the up fitter switch. None of those options are"clean".


What is a cleaner install is using a device like Wicked Warnings' universal park flash unit- this will still consume 3 switches but it's a dual relay set up that won't burn out your flasher over time and I think that unit has 25+ flashing modes. It is what some of our volunteer county EMS vehicles use. Another option is the Atomic LED flasher but the wiring is more complex.


the Rigid and Sho-me flashers really aren't designed with constant on and up fitter switches in mind.


EDIT: I received several PM's on this- YES, you can use two SPDT switches wired together instead of a DPDT relay- infact this may be cheaper/easier to find 2 waterproof SPDT switches than a single DPDT. If none of this makes sense let someone else do it or use a commercial solution like the Wicked warnings module  (I have no affiliation with Wicked warnings, just know it works.)


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