Wiring does not wear out like a valve or piston ring. You may need to unplug them from the electrical system to test the rest of the wiring in the system. If there is a break in the wire there will be No Continuity, meaning the resistance through the wire is very high or infinite.Īlso remember that while the source coils under the flywheel supply the power for the electrical system, they only work when the flywheel is turning. If there is no break in the wire it is called Continuity meaning there is no resistance in the wire. If you use the Ohm Meter it will send a very low voltage charge through the wire and measure the amount of resistance to that low voltage charge going through the wire. You can't use a Circuit Tester Light but you can use an Ohm Meter. What's that you say? Your motorcycle is a dirt bike and has no battery? Not to worry. All this is really not that difficult with your Wiring Diagram leading the way. Also, remember that the power goes through the end device and then on to ground. Each Power Destination (like a fuse block) or Device (like turn signals, lighting, voltage regulator, etc.) has its own combination of colored wires. This is why there are so many colors of wire. This hot wire can run all over the motorcycle with other different colored wires going from the hot wire to the Power Destination/Device. Usually, not always, just usually, the hot wire from the battery is a red one. If there is voltage going to the device and the device ground is good but the device is not working. If there is voltage, go to the next connector or powered device/power destination. If there is no voltage at that first connector, follow the wire back to the battery, looking for frayed or broken wires. With a fully charged battery and a Circuit Tester Light or an Ohm Meter, trace the voltage (6 or 12 volts) from the battery to the first connector. I like to start right at the power source, the battery. Then follow that wire color back to the battery. Look for the hot wire going to the turn signals. Start at the offending turn signals and find out what color wires go to them. If the turn signals don't work and the lights do, you do not need to test the lights. If all looks OK, get out your wiring diagram and find out what color wires you need to test. Now what? First, give everything a visual inspection. So something is not working and we have a Wiring Diagram. The Auxiliary and Accessory Circuit Diagram, The Starting and Charging Circuit Diagram, The Lighting Circuit Diagram and The Complete System Circuit Diagram.Īuxiliary and Accessory Circuit Starting and Charging Circuit Below is the wiring for a Triumph Rocket III. Sometimes, the Motorcycle Manufacturers help us in this by separating out the wiring for major systems making it easier to decipher them when a problem occurs. Here are some wiring diagrams so you can see what I mean. I had to cut into the wiring bundle and separate each wire and test it till I finally found the fault. I found it hard to believe but it was true. I remember way back in 1972 working on an Austin-Healey Sprite sports car, which they tell me is the same as an MG Midget sports car, while I was in the army. Fortunately, things have gotten better over the years. Some have each wire with a color ID Initial like G for green or Br for brown and the like. Some have the wires drawn with the appropriate color. In fact, there can be several methods to the madness, so to speak. While these Wiring Diagrams may seem confusing there is a method to their madness. To fix a fault in this mess of wiring we need to remember each system is separate. However, if we want all the fun stuff we put on our Motorcycles to work, we have to have what is essentially a combination of many different wiring systems. The complication can be almost unbelievable. A Ground wire or Ground to a frame.įrom here the skies the limit. Such a Device can be a Light Bulb, CDI box, Instrument Cluster, Switch, something like that. Such as a Battery or power from Source Coils under a Flywheel. The Simplest Wiring System has just four parts. No Charging System, no Turn Signals, no Brake Lights, no nuthin'. Without a Wiring System there will be no light. "And God said, Let there be light: and there was light.Īnd God divided the light from the darkness."
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