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CB125T, EX250 commuter, Ninja 250 racebike, CBR250R(MC19), VF500F, CBR600RR, VFR750F
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Trace power along wires from brake-lever switch all way back to light bulb.

  • Measure voltage going into brake-lever switch, volts = ???
  • squeeze lever, strap to grip with zip-tie, measure voltage leaving brake-lever switch, volts = ???
  • follow wire to next junction, measure voltage at terminal by back-probing connector. Volts = ???
  • continue to each connector on circuit until you reach brake-bulb socket

Where power disappears indicates problem is between that location and previous one that did have power.

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