Question about 2002 Ducati Monster 750 i.e.

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Tail chop performed, brake light doesn't work

Only wires not altered in the procedure and only one with problems. Tail light works fine but doesn't brighten when brakes applied, either by pedal or lever. When I switch the hot leads on the light it is brighter. Possibly a bad relay? There is obviously power coming from the regular tail lead but apparently not the brake lead. Any other suggestions? Fuses fine. Bulb replaced.

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  • inanecommuni Nov 23, 2008

    The problem isn't that the light doesn't work at all, I do get the tail light. It just doesn't brighten for the stop light. I've checked the switches, I've checked continuity on as much of the wire harness as I can access and everything seems fine. I've also changed the bulb. I even get power from the brake light lead but the light won't work. I've checked every connection I can find. I'm stumped so I just ordered a new LED taillight with integrated signals. If that doesn't solve the problem I'll post back. Thanks.


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Offhand, in most bikes, the tailight and the brake light are integrated in a single bulb with a common ground. This would translate then into a 3wire arrangement. The brighter of the filaments is for the brake while the dimmer of the two is for the park/running/tail light. To my knowledge, either the tail or brake lights do not use a relay, they are wired straightforward. Your described problem all points to a mis-connection, possibly the ground wire. The easiest approach would be to identify the ground wire. With ignition switch off, all light switches off, identify the ground wire with the use of a continuity tester (VOM/DVM). Disconnect the wires to the harness, on the harness, it would be the wire with nearly 0 resistance against any exposed metal or the chassis. On the wires going to the tailight assy, it wold be the wire that measures 0 ohms to the metal socket/housing of the bulb.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 21, 2008

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