I'm not sure this was already discussed but I couldn't dig deep old post. I'm designing a module which is capable of driving foglights in 3 different modes (static on, synchronous flasher, asynchronous flasher and off) and flasher for brake light.
For the brake/tail light, I want it to flash when I brake. Circuit is ready but I'm confused about how to connect it to motorbike's tail light wiring. I saw a similar product, which suggest to strip existing 3 wires (Blue, Black-Yellow, Red) and directly connect module's wires to tail light wire. Here is a image they provide.
(Sorry it is in Turkish but I guess you understand what I mean. In the image there is another tail light, so you avoid it)
This didnt make sense to me. Here is why: When I brake, blue wire will be 12V and it wont matter if I flash it from the module because it will be on always. So in my opinion I should cut the connection of blue wire from LEDs. Blue wire should get into module and another wire should go to LEDs instead of blue wire. So please share your ideas if I'm missing something.
Btw I already designed and tested electronic hardware and software of the fog light functionality (I will upload the video soon) but I haven't connected it to motorbikes electric system yet. I want to use pass button as an option. Fog lights will be enabled whenever I press the pass button. When I check motorbikes wiring diagram, I realized pass button is connecting "low headlight" to "high headlight". So it is not like one pin goes to high headlight and other pin of the switch goes to ground. This is also not like usual low-power electronic design.
Sorry for long post.