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I ordered the Visipath headlight modulator and tail light flasher kit. You can also buy these separately. The headlight modulator comes with an adapter cable so you can just plug it between the bike connector and the headlight. Simple plug and play -- almost. That might be true with a large headlight. If you have a small 5 and 3/4 inch headlight, like I do on my FXDLI, all that won't fit inside the headlight assembly. It can be mounted outside somewhere, but I considered that unacceptable. I started to return it, but decided to modify it instead. I discarded the adapter cable with its bulky connectors and simply spliced the modulator between the bike wiring and headlight connector. (I can provide wiring instructions if needed.) I then trimmed a little extra plastic from the modulator itself and it all fit nicely inside the headlight. There is a light sensor that you run through the existing rubber headlight grommet up into the wiring bundle between the risers. A couple of black wire ties and it's virtually invisible. The unit can be wired to flash either the high or low beam of the headlight. I chose to flash the high beam so that when riding in a group or stopped behind a cage for a long time I can flip to low beam to stop the distraction. At dusk or in a tunnel, the light sensor will cause the modulator to cease operation. If the the modulator ever fails it is designed to fail in the off mode, allowing normal operation of the headlight. It certainly seems to work well as I believe it causes the bike to be noticed more easily. (I still ride like I'm invisible though!) It is legal in all states.
The tail flasher will flash your tail light four times rapidly before going on steady as long as brakes are applied. It comes with just the flasher module and again it would not fit inside my small tail light assembly. I mounted it on the inside of the fender behind the tail light and ran the wires through existing openings there. Works as advertised. If you have additional tail lights in addition to your stock light, these can be flashed as well. The only limit is the amperage rating.
The better modulators do not actually flash your bulbs on and off but rather modulate them from about 20 percent to 100 percent power. This keeps from shortening bulb life. Anyone handy with electronics can build the circuit fairly easily. I looked into it and by the time I bought the light sensor and components I decided to buy it already assembled in a good waterproof module.
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