Most torque converters have a stall speed around 2000 - 2500 RPM. Which also happens to be the RPM range that your vehicle normally runs at cruising speed. At a lower speed you would be simply running a viscous coupling between the engine and transmission.
Then, thereâs the obvious choice: A dynamo attached to one of the bike wheels. (These devices in general are called generators, but when attached to a bike, a generator is traditionally referred to as a dynamo.
Even though, there are plenty of Dynamo Bike Light instructions on this site, I thought I would share mines. The great news, there are NO resistors in my circuit. It has a fixed 5 volt output, so you can ride as fast as you want without worrying about burning out the LEDs.