I wanted to convert my 1974 motorcycle lighting from the increasingly rare 6 volt system to an all LED system. This article focuses on the turn signals.
**NOTE** Some may notice I neglected to include a resister. I had plan to place it elsewhere in the harness, but I may just integrate it into the signal housing later (recommended). I also recommend using something more durable than cardboard to secure the LED in the signal's socket (step 9). I just use it because it was what I had on hand at the time; I'll be changing that later, too.
**ALSO** This is my first instructable, so if something is out of place, forgive me.
Here is the signal we'll be working on today. This particular lamp has two screws holding the lens to the signal body.
After the lens has been removed, you'll find the ancient 6v bulb snugged into the housing. Now would be a good time to remove the bulb. (I kept it in to explain the next step.) You may notice the bulb appears dark, or dirty. This is usually a sign the bulb is near the end of it's life. In most 6v systems, once a bulb blows out, it usually snowballs until they are all blown out. You'll want to remove the three screws holding the rubber bulb housing in place. Take note of the grounding wire held in place by one of the screws, take care not to damage this.
Note that the grounding wire is soldered to the base of the rubber bulb housing. This connects to the side of the bulb and grounds it through the body of the motorcycle, while the live wire makes contact to the bottom of the bulb. This completes the circuit and illuminates the bulb. We will be using the same concept to light the LED.