submitted 8 months ago by JayleneSlide@lemmy.world to c/askelectronics@discuss.tchncs.de

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I have a Roxim Z3EK bicycle headlight. This light is supposed to have a low and high beam function, but I can only get the low beam to work. So far, I have tried:

grounding the green wire
sending 12V+ to green
sending 12V- to green
bridging the green and black wires
bridging the green and white wires

I emailed the manufacturer asking for a wiring diagram, but no response.

I appreciate any guidance y'all might have. Thanks!

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[-] JayleneSlide@lemmy.world 4 points 8 months ago

In my opinion bicycles should not have a high beam

This is StVZO-compliant light, i.e. has a sharp beam cutoff.

Look inside, do any components look fried?

Tracing the circuit was my first thought. It would be difficult to open the housing non-destructively. Even if I could open the housing, getting it back together and restoring its IP rating would be sloppy at best.

Can you get the led to light by applying the a low voltage with a current limiting resistor directly to it?

Yes, the low beam works starting at ~7V with the negative and positive supply attached as pictured.

this post was submitted on 27 Dec 2025

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