Hi, recently I've been trying to install a new LED headlight on my CBF 125 M9 for multiple reasons (mainly as it's almost traditional for a 17 y/o) but I've been running into problems. The first bulb I tried blew after a couple of seconds of working fine, I returned and refunded it. The second bulb had much better reviews online so I went with it, fitted it, but it flickered at an unacceptable and likely illegal level. I tried my best to understand why this was and came to the conclusion it was because the headlight wiring was AC and therefore very inconsistent, (the flickering lessens at higher revs, as expected) which was unnoticeable with the old halogen but that's not the problem I'm here for. I ordered a resistor that you'd just plug inbetween the wire and the bulb, theoretically fixing the issue, but no light was coming out of the bulb at all when it was plugged in (I tried both to see if it was a fault in the part, no joy.) Then I decided to measure the voltage of the wiring to see if that was the problem, and this is where it gets interesting; on lowbeam setting with my positive probe on the battery terminal and the negative on the lowbeam connector, I was getting a reading of 22 volts, the same if I tested the high beam. Now my battery, being a 12V battery, surely shouldn't be able to output nearly as much as that?
With the resistor fitted, all 3 terminals were reading 13.7V but that's likely because it is a 9-16V resistor and it's being given more than that.
I'm not sure if this is a simple problem or fault in my testing but it puzzled my dad, who's been a master technician for 4 years or so.
Any and all help and advice is appreciated.