I just bought my first hub dynamo (Shutter Precision PL-8) with dynamo headlight (Busch + Müller Lumotec IQ2 Eyc N Plus). After installation I figured out that light is not working. How to determine what actually is not working?
When checking a Dynamo system, there are 3 basic items which need confirmation:
- Power Supply: Is your dynamo producing power? Checking this requires a multimeter, preferably with alligator clips on the wiring, and to spin the hub. Or there are specific tools, as well.
- Wiring continuity: Are all connections tight? Are there any breaks/shorts in the circuit? This can also be checked with a multimeter. It is best done by isolating each section of the circuit to check, and then verifying the connections between the sections.
- Light Source: Last, check your light source. Change the bulb if possible. Use an alternative 6v power supply to check whether the light head is functional or if there is an issue elsewhere in the loop.
Busch & Muller make a rather expensive tool for troubleshooting a dynamo.
Thanks for replies everyone (especially zenbike)
After light disassemble i found out what was the actual problem. There was a extra-solder where wires soldered into board that causes short circuit. After that extra was removed light have come to life (YouTube).
Busch + Müller are high quality expensive lights, but seems like it is not expensive enough for simple quality-control testing