How To Wire A Brake Light Switch
If the brake light is on with the pedal at rest, the button needs to be pushed in by using a screwdriver to pry the button back into the housing. If the brake light does not come on when the pedal is pressed, the button needs to pulled out, and the switch should be removed by rotating the housing a quarter of a turn.
Bob reviews a common problem that can accrue when you are working in the switch housing area of your motorcycle. Time, patience and maybe a new brake light switch can show you how to fix a motorcycle brake light switch. Bob also shares how to test a Harley brake light switch near the exhaust in a related video.
Some have the tail light wire running through them (4 wire into 3 wire), and some don't (3 wire into 2 wire). It doesn't make any difference, as the tail light wiring isn't affected. All you're worried about is the brake and turn signal wires. Note: Don't try to run them with LED's. The converters aren't made to run the extra voltage.
5 minute job after obtaining new switch & locating old switch under dash by brake pedal. be sure to observe how switch is positioned before removing. one of 2 nearest to steering column! twist 1/8 turn counter clockwise & pull out switch. pinch connector release & pull connector off old switch! install connector onto new switch & reverse removal process.
The brake light switch is a mechanical switch activated when you press the brake pedal. The switch has a plunger in it that contacts a lever in the brake pedal assembly. As that plunger is depressed when you push on the brake pedal, the contacts in the brake light switch closed and voltage flows to the brake lights — turning them on.
The LED light has a 3 wire harness connected that fits perfectly into the bike's harness. It also contains 1 yellow and 1 blue wire which I have spliced into the positive left and right wires coming from the bike's harness. Rear brake light doesn't come on when activated, front brake activates light intermittently.