Ebike Conversion Notes
10 July 2011
My brother and I are working on converting his old Diamondback mountain bike to a hybrid human/electric bicycle. We picked up some stuff from Sick Bike Parts and TNC Scooters. I thought I would post some notes on the conversion project as the process can be far from intuitive.
First, I thought I would make a note for posterity that the 24V Throttle with LED Indicator does not actually require a controller with power-status output. The throttle has four wires, and acts simply as a potentiometer. The wires are as follows:
| Throttle Wire | Controller Wire | Description |
| Red | Red* | +5V Power (to potentiometer) |
| Black | Black or Yellow* | Ground (for potentiometer and LEDs) |
| Green | Green, Blue, or White* | Throttle Signal Output (0-5V; potentiometer wiper) |
| Yellow | Orange or Yellow | Power Status. The included slip says this wire can be ignored if using a three-wire controller. However, this line simply uses a voltage directly from the battery to light a resistor divider with LEDs. Thus, you can connect the power indicator LEDs directly to the battery output, and the throttle will show the battery charge. You may want to run this through our main switch so the lights aren't always on. |
Note: On the Yi-Yun controller we bought, these three cables for the throttle control are labeled “dérailleur.” I can only assume it’s a translation error and that the manufacturer intended to say “throttle.”