The rats nest of wires in an ebike can be a bit daunting until you figure out that you only need a few of them to get started. The extra wires are for additional functionality that you may not need. Getting started only requires 5 connections.
1. Battery to controller - main current. These are the thick wires that carry the current from the battery to the controller. Two wires: red and black.

2. Controller to motor - phase wires. These are the thick wires that carry the phase current from the controller to the motor. Three wires: blue, green, and yellow.

3. Motor to Controller - hall sensors. These are the thin wires which enable the controller to know the position of the motor. Four wires: yellow, blue, green, and red

This connector is a bit confusing because there are four wires on the motor side and six wires on the controller side. We will see one of the red wires on the controller side in step 5.
4. Throttle to Controller. These are the control wires which carry the throttle signal to the controller. Three wires: red, green, and black.

5. On/Off Switch. These are the control wires which disable the controller if the switch is turned off. Two wires: yellow and blue.
This is where we use the extra red wire that came out of the controller side of the hall sensor. The second red wire goes to the single wire connector on the battery harness.
That should be enough to get a new build running with speed control.
1. Battery to controller - main current. These are the thick wires that carry the current from the battery to the controller. Two wires: red and black.
2. Controller to motor - phase wires. These are the thick wires that carry the phase current from the controller to the motor. Three wires: blue, green, and yellow.
3. Motor to Controller - hall sensors. These are the thin wires which enable the controller to know the position of the motor. Four wires: yellow, blue, green, and red
This connector is a bit confusing because there are four wires on the motor side and six wires on the controller side. We will see one of the red wires on the controller side in step 5.
4. Throttle to Controller. These are the control wires which carry the throttle signal to the controller. Three wires: red, green, and black.
5. On/Off Switch. These are the control wires which disable the controller if the switch is turned off. Two wires: yellow and blue.
This is where we use the extra red wire that came out of the controller side of the hall sensor. The second red wire goes to the single wire connector on the battery harness.
That should be enough to get a new build running with speed control.
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