Hi everyone, been lurking a couple weeks and as an electrical engineer I impulsively thought I'd throw up a possible solution to the many requests I've seen in this thread. I could build something like what I've shown here pretty easily. Actually, it could all be done with discrete components too, no need for the PIC really. But, the PIC could allow for additional customization such as adjustment of the timing for flashing while in reverse.
This design operates automatically, turning on with fog lights, flashing with reverse and turn signals. No need for extra switches.
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