Electric Bikes - Wiring a light to controller, not working

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reptilian
09-24-08, 04:20 PM
Can anyone help me out? I tried to wire a 72 led light to the wires for my brake cutoff, but it doesn't work. It's the proper voltage. The wires provide 4.9 volts and the light uses 4 AA batteries. Why will it not turn on?

Antranik
09-24-08, 09:10 PM
Your brake cut off wires have 4.9v running through them?
cerewa
09-25-08, 01:56 PM
The brake cutoff wires are probably designed to output, at most, a small fraction of 1 watt, at 5 volts. Your lamp is probably designed to receive at least 5 watts and it won't work at very-low power.

Put another way, the amperage maximum on your brake cutoff wires is very small, and if you go over that amperage maximum the voltage drops and you're no longer getting 5 volts (more like 0.1 volts) and your light doesn't work at 0.1 volts.