CornerCarver

The diodes serve well as a safety function, but do little else. If there is voltage present on either the running light feed or the turn signal feed, the bulb will be lit. Having voltage from both connections simultaneously will not brighten the bulb enough to be of any use. So, it's not a matter of providing two different signals. Rather, you wire the mirror as a running light, then use the turn signal feed to activate a relay which lifts ground for that bulb. You'd want it set up something like this, using a 12 v single pole dual throw relay: The numbers are the connections on a standard relay. 85/86 are the coil connections, Agreed except for the line "diodes serves well as a safety function, but do little else." Without the diode (an electrical check valve for us plumbers) the electrical current back feeds from the running light wire to the turn indicator (when connecting any two wire light to the VFR's three wire circuit) and this circuit makes both turn indicator lights on the dash stay continuously lit. During daytime riding it is annoying, at night is a potentially dangerous distraction. You could also correct this as I have seen many older VCR owners do back in the day...a piece of electrical tape across the flashing "12:00" on the dash.

The 98-99 VFRs without cats are among the best fueled stock bikes ever made.