How to Test a 3-Post Bi-Directional Motor

How to Test a 3-Post Bi-Directional Motor

May 21st 2018

How to Test a 3-Post Bi-Directional Motor

This test will work for any three-post, bi-directional motor. Before you test your motor, you will need to remove it from the vehicle. Watch the full How To video below. 

What You Will Need

  • Battery Jumper Cables
  • Jumper Wire
  • Working Battery (Take one from a working vehicle if possible. Battery must have 12.5 volts. DO NOT use a jump box)
  • Vise to Hold Motor (You can have someone hold the motor if you don’t have a vise)

Bench Testing

Place your motor in the vise or have someone hold it carefully.

Step One: Place your motor in the vise or have someone hold it carefully.

Attach the negative (BLACK) battery cable to the to the negative terminal of the battery. The other end will need to be attached to the motor case.

Step Two: Attach the negative (BLACK) battery cable to the to the negative terminal of the battery. The other end will need to be attached to the motor case.

Counter Clockwise

Clockwise

Step Three:
Counter Clockwise Rotation: Attach the positive (RED) battery cable to the positive terminal on the battery. Attach the other end to the F1 post of the motor as shown above.
Clockwise Rotation: Attach the positive (RED) battery cable to the positive terminal on the battery. Attach the other end to the F2 post of the motor as shown above.

Counter Clockwise

Clockwise

Step Four:
Counter Clockwise Rotation: Attach one end of your jumper wire to F2 post of your motor. Attach the other end of the jumper wire to the remaining A post of the motor.
Clockwise Rotation: Attach one end of your jumper wire to F1 post of your motor. Attach the other end of the jumper wire to the remaining A post of the motor.

As soon as you touch the end of the jumper wire to the A post of the motor, the motor should start to spin in the counter clockwise or clockwise direction. If the motor fails to spin, then the motor is faulty and needs to be replaced.