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Ebike headlight controller

(Feb. 6, 2022)

Three lines coming in from controller over 3-pin JST:

I put a volt meter on the purple line coming out of the control box. It was usually at zero volts relative to GND, but went to ~3V when I turned on the headlamp.

I had a RFP12N10L logic-level N-channel MOSFET on hand that I think will do the job

One weird thing is that the headlamp's power line is blue and its ground is red, so I had to wire up the JST connectors in a way that looks incorrect.