Signal Lights are Intermittent

By Mark DiPietro

Question for Fix My Hog Having problems with a 1992 FLTHCU. Signal lights are intermittent and brake lights are not lighting up. Any suggestions? I have changed all the bulbs.

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Fix My Hog Answers Get out your test light. You will need to chase some wiring. The signals & brake lights would be two separate issues on your make & model. For brake light, remove your taillight lens. Use your test light to verify that only one contact has voltage (running light) with ignition switch turned on. If both contacts have voltage; one if your brake switches is stuck on. This might make it seem as if you have no brake light because the light does not get brighter when applying brake pressure. Inspect your taillight harness and taillight assembly. Make Sure The harness is intact. Otherwise, start testing at your brake switches, front & rear. Test to verify voltage. Test your way from the switch and out. Pin point where, switched, voltage is lost. For the signal issue; you may have a week connection or ground if they work intermittently. Start testing at the signal housings and work your way toward your turn signal module. Your service manual has a map of your wiring harness. It can be a good reference.

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2 Responses to “Signal Lights are Intermittent”

  1. Tracy

    My wires to my brake/turn/ taillight were rubbing on my tire and shorted, might check above the rear tire, but that's on a 97 lowrider.

  2. Nick

    I had signal lights an brake light problems an chased wires around for quite awhile. Turned out , there’s a very small wedge that goes inside brake lever housing on lever !!! 50cents !!!! Check that, could be problem!!!