Originally Posted by Boxcar Bill:
Can you apply power with jumpers and watch the motor and gears.
Bill
I see the wisdom of your suggestion Bill. I did the test that you recommend and here are the results.
The front motor purrs like a kitten, smooth as can be in both directions. The rear motor, stalls and studders below 1/4 throttle. Anything above and it runs in step with the front motor. Gear sets sound good. I checked the wire connections for the motor leads under the wire nuts (blue and yellow wires) and nothing abnormal. Both motors are wired in parallel and should be moving the same, all the time.
I will separate the motor from the truck and repeat the test to confirm that I don't have low speed gear set drag. If the motor continues to stall/studder when removed then I'm thinking of either a high resistance connection/wire or a internal motor problem.