fyl1982,
Grinder's method is better as the diodes in the example I gave you do nothing to isolate the single indicator, the resistors will make the circuit operate like it did originally with the added resistance in parallel with the lamps albeit defeating the advantage of the LEDs.
Read this:
Generally speaking, most of the problems in an LED conversion will center around the turn signals.
In all of our old bikes the signal relay depends upon a certain level of current in order to create the flashing you see when you signal left or right. Because LEDs use so little current, this isn't enough to trigger the flashing in the old relay and so the lights will stay solid.
There are two solutions to this problem. The first solution is to add resistors to each of the lights, but this is a poor option. Part of the reason for going to LEDs is to use less power and if you add resistors to the circuit, you're using more power. The true solution to this problem is to replace the stock turn signal relay with a digital model specifically designed for LEDs. These can be had for under $10 and it's a lot easier than wiring in a bunch of resistors.
Another common issue is that the stock single <>indicator light (in the dash) isn't setup to handle LEDs. This is because LEDs are polarized. Current will only flow through an LED in one direction. That is, the positive and negative matter. Incandescent bulbs don't care about polarity and the Honda engineers used this to their advantage to simplify the wiring. If you want to keep the indicator light but also use LED turn signals, some changes will need to be made.
For a stock indicator light, both the left turn signal wire and the right turn signal wire connect to the bulb and the wires alternate as the positive and negative depending on which direction you're signalling. For LED signals, this indicator light now represents a crossover that will cause all four signals to light up at once, regardless of which direction you're signalling. The solution to this problem is to the polarize the indicator light by preventing current from traveling between left and right circuits.
This is done by treating the left and right signal wires, together, as positive and then adding a ground wire into the circuit. The current can be "forced" in one direction by the addition of an electronic component called a diode.
By removing the left and right signal lights from the indicator bulb and wiring a diode onto each end, we allow the current to flow into the bulb, but not back up the other side's turn signal circuit. After the diodes, the two circuits can be spliced together and we now have no worries about the crossover. The spliced section acts as the indicator light's positive side and the negative side gets a new ground wire that you will need to attach.