On the stock system the power cokes to the flasher on the brown wire, out to the turn switch on the brown/white wire. The other wires are used by the self canceler.
On the older bikes with a stock 3 prong flasher, 3 prong flashers from the parts store won't work. On 4 prong flashers I have read the same thing.
It may be possible to rewire your bike to use one of these flashers. I don't know how myself.
I do know that you can use a 2 prong flasher and they work well. The one drawback is the self canceler won't work. Noit a real problem, just have to remember to turn them off manually.
I use flasher from Super Bright LED's. Item # LF1-S- FLAT. It comes with wire leads coming out to a plastic plug block. The wires can be removed from the plug block. This leaves you with blades on the wires that plug into the stock plug block. On the plug block you will see where the brown wire is, plug the red wire in where the brown wire is, plug the black wire in where the brown/white wire is. Some of the flashers may come with a grey wire instead of a red wire. Just plug that in the brown.
On the later bikes they used a single indicator bulb. This bulb has one lead hooked to the right, one to the left. As the turns flash the bulb draws power from one side and grounds through the other.
When you convert to LED's this set up cross feeds and makes both left and right to flash at the same time. Unplugging the indicator bulb lets them work fine. Most like the indicator light. To make it work right you need to do a bit of a rewire on the indicator. Trace the wires down into the headlight bucket. Unplug them. Build jumper wires that plug in harness side plug.. On each wire from the plug you hook in a diode. One the other end of the diodes you hook them together with a bit of wire. Hook this wire into the indicator wire plug. The other wire in the plug run a wire to ground.
I have a wiring diagram I'll post up.
Leo
