Question about 2002 Ducati Monster 750 i.e.
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.
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
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jul 24, 2013 | Motorcycles
Aug 05, 2012 | 2000 Ford Expedition
Jun 12, 2012 | 2001 Isuzu Trooper
May 01, 2012 | 1999 Jeep Grand Cherokee
Jul 31, 2011 | 2009 Keeway Matrix 50
Jul 06, 2011 | 1993 Toyota Camry V6
Jan 14, 2011 | 1995 Pontiac Bonneville
Dec 28, 2010 | 2005 Jeep Liberty
Oct 06, 2009 | 2002 Toyota Highlander
Mar 31, 2009 | 2006 Dodge Stratus
754 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: