I recently installed a 'Smart Turn System' on my 2000 Honda Valkyrie Interstate. I found it to be a great tool for ensuring my blinker was turned off after completing turns and even lane changes.
The system is a control unit you insert between your handlebar controls and the bike's existing electrical system. It does require you to crimp onto some power sources and cut the left, right and neutral wires and attach bullet connectors under the left fender area. Installing it was fairly simple and doesn't require much knowledge of electrical components as instructions walk you through everything but a 12v feed, I used the blue with white stripe wire to my headlights. Something to note about the cutting process is that since bullet connectors are being used you can remove the mod if you decide it's not for you by simply taking the module out and directly connecting the old wire directly together again using the bullets installed in setup. An issue I saw in installation was that because of the amount of small length of wire I was working with I had some of the connectors come undone. As a work around I took a shouldering iron to the wires once I got the tips on to ensure a snug and permanent connection, but this isn't required.
There are also rubber disks you place into the turn signal housing to avoid having the turn mechanism stick to one side. It's a mechanical system, remember that you're installing a computerized controller to override this system on how long your turn signal remains on. Others installing it, including myself, have had to use a scissors to trim these down to a thinner level than given in the kit as leaving it too thick will prevent the turn signal from initiating. I'm sure over time the disk may be mashed down and need to be replaced as it is foam.
As far the accuracy of the unit in detecting turns, it seems to work nearly every time. I believe the device uses a number of sensors measuring tilt inside a tiny box mounted on the frame of the bike (pointed with a certain side up and an arrow on top of the unit forward) which I found to be a bit of a pain to mount. I installed this the night before my girlfriend wanted to go on a road trip to the northern part of Wisconsin so I jammed the thing under the gas tank and zip tied it to a wire harness. I'm sure if I mounted it to the frame it may be even more accurate since It's not exactly pointed forward and I'm sure it's at a slight tilt to the right. The only issue I've seen is that slight right turns aren't picked up which is likely attributed to the orientation of my unit.
There are other turn systems I've seen suggested here like the Signal Miner which operates off an assumption of time the signal should be on. I wanted something that used the physics of actually completing a turn so 'Smart Turn System' fit the bill for what I wanted. Something to note is it doesn't contain the 'bonus features' of the other system which may be something others are looking for. It doesn't add a LED flasher relay (available separate from Custom Dynamics), running lights in the rear (I've seen mods on the forum to alter electrical flow), or hazard flasher functionality. Even without these features I believe it's definitely worth considering if you're looking for an automated turn signal experience; it's worked really well for the last three days I've had it. See below for helpful videos and a picture of how I wired it.
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Manufacturer's website:
https://www.safer-turn.com/us/My wiring:
https://photos.google.com/photo/AF1QipOagdQzN6jmB6Y9yRTF4m0RMstoHPj4u_uGzTuMOther individuals review of turn system:
https://www.youtube.com/watch?v=twNrQldtSDwOther individuals installation of turn system:
https://www.youtube.com/watch?v=tsElYjllJfI&t=3sVideo on wire shouldering (helped to secure connections but not needed):
https://www.youtube.com/watch?v=9ErNVJytyNsVideo on cleaning Honda turn switch since it's opened for installation anyways:
https://www.youtube.com/watch?v=Ob4JWFQ6aTc
