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I'm going to need to buy a multimeter aren't I
Unless you have some bulbs and wire knocking around then it’s probably your best route.
M_V-
So I would then test 1. voltage from the hub connector, and if that works, 2. voltage at the end of the wire to the front light, and if that works, 3. voltage at the connector from the front light to the rear light wire, and if that works, 4. voltage at the end of the wire to the rear light, and if that works, it's the rear light?
I know nothing works if the rear light is connected the wrong way around, so presumably a fault anywhere in the system means it'll all be off
lemonade
Dynamo woes. Always used to work, has now stopped working - both front and rear - without me changing anything. Wiring seemingly fully connected. The SP hub is only a few months old, the B&M lights are many years old. Possibly water damage as the front light is slightly foggy inside - although this has been the case for years without any ill effects.
What order should I start trying to diagnose problems in? I'm going to need to buy a multimeter aren't I