Brake Light Problems
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Thread: Brake Light Problems

  1. #1
    Very Active Member
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    Default Brake Light Problems

    Trying to hook up a custom light I made. Here is my problem. I have 3 wires. One is obviously ground. One seems to be the tail light because it's always on. The last wire has me baffled because it's hot at around 11.5 volts until I hit the brake and then it drops to a couple volts. Anyone ever heard of this? Could it be a bad switch? I'm baffled.

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  3. #2
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    The brake light switches earth the feed not send power to the brake light so the wire for the brake light will have power

  4. #3
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    Quote Originally Posted by The Prospector View Post
    The brake light switches earth the feed not send power to the brake light so the wire for the brake light will have power
    That's what I figured but when I tested it with another hot wire it didn't produce voltage when I hit the switch.

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  6. #4
    Very Active Member NoSetFine's Avatar
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    The stock wiring to the brake light is:
    (Chassis Connector) > (Lamp Connector) > [LAMP]

    BRN > GRN > [LAMP] = Running light +12V
    B/W > B/W > [LAMP] = Ground
    W/B > W/B > [LAMP] = Brake Light from Lever Switches (Bright) +12V

    Our brake light is designed for dual-filament (dual LED) operation - one dedicated for LOW light at 12V, one dedicated for BRIGHT light at 12V.

    Click image for larger version. 

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  7. #5
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    Just want to say, I'm a dumbass. I had my brake lever off and was testing the switch with my finger. In putting the lever back on, I discovered it's a normally closed switch that is held down by the lever keeping the circuit open. When you squeeze the lever, it lets off the switch and completes the circuit. I can't believe I spent all that time scratching my head when the answer was so simple. Thanks for your help everyone.

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