For those who have been looking for a replacement for the stock PC800 flasher unit (P/N 38301-MF8-771), the wait is over. Behold the Tridon EP-34 LED, 2-6 lamps, 12.8V/162W max, trailering, assembled
in USA, DOT. It’s available on Amazon or at your local auto parts store. It is a three prong relay that fits into a headlight bulb harness (available at any auto parts store). The pin-out is:
B = Black/brown stripe
L = Gray
E = Blue/black
Note that the B and the E are reversed as compared to the stock flasher unit on my PC800. Gotta love Japanese turn signal wiring. Also note that this is on my 1989 PC800. I am the 5th-ish owner so it is very possible that the sub-harness was replaced with a newer model at some point.
Looking at the relay side connector pin-out (using a Hitachi connector), with the retaining tab at the top, the pin-out is:
Left = B
Middle = L
Right = E
Also note that I have bypassed the self-cancel turn signal control unit. I believe I toasted the one on my bike and am too short of money at the moment to purchase another unit for testing purposes.
In conclusion, you can do a full turn signal system LED bulb conversion with this relay without needing load balancing resistors or any fancy DIY circuitry. Everything you need should cost about $25.