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Quick and dirty way (dirty because relays are so large) is to wire up the ign to the relay input and have the flasher circuit on hooked up to the NC side with the +12v constant to the COM.

IGN turns coil on, switches COM to NO, turns flasher off. IGN turns off, switches COM back to NC, turning flasher on.

Chuck a fuse or two in between the relay and IGN as well as relay and +12v constant so if anything shorts out while you're messing with it you don't fry something important.

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https://www.sau.com.au/forums/topic/180481-flashing-led/#findComment-3285425
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