GalaxyRVR Rover motor issue

The wheels on the right side are not working. The motors on the left side work and if I plug in the right side motors into the left side, they work.

Using dupont jumpers to connect to the pins, I see voltage of 7v on the pins individually. But if I plug in a motor and read the voltage again, the voltage drops to less than 1v.

Any help with figuring out what’s going on is greatly appreciated.

The motor interfaces on the expansion board, if they are motor 1, motor 2, motor 3, motor 4, motor 5, motor 6, the corresponding motors are motor 1, motor 2, motor 3, motor 4, motor 5, motor 6, the left is 1, 2, 3, the right is 4, 5, 6.
Your problem is: motor 1, motor 2, motor 3 interface of motor 1, motor 2, motor 3 does not work, after interchanging the wiring position of the motors, motor 1, motor 2, motor 3, motor 4, motor 5, motor 6, the corresponding motor is motor 4, motor 5, motor 6, motor 1, motor 2, motor 3. then motor 1, motor 2, motor 3 can work normally, then can motor 4, motor 5, motor 6 work normally?
Hint: Do you have sufficient battery power to work yet.
If you can, we suggest you provide the problem video to us, so that we can help you analyze and solve the problem.