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Can someone advise how to measure output from a bike generator/dynamo ? Answered

This is the type that clamps onto the seat stay and is meant to rub the tire for the generating action. It's labeled 12V, 6W, Made in Japan. Two terminals, H and T. I've hooked it up to a meter and the only setting that gives me any sort of reading is AC volts with either H or T and to what I assume would be chassis ground. That gives me between 3.7 and 4 volts when I spin the unit with a cordless drill. Is this thing functional or not? And what would be proper wiring connections for it? Many thanks!

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Dr.Bill (author)2009-05-22

they produce ac. hook-up the meter and go for a ride.

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NachoMahma (author)2009-05-02

. I'm guessing that H = headlight and T = taillight. They may be connected together internally.
. The drill may not be spinning the generator as fast as a tire will.
. Find a 4-10 W @ 3-6 V bulb and see if you can make it light with the drill. Connect to H or T (shouldn't matter which) and the generator case (ground).

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