you'll be able to find out more if you pull the gearboxes, since the motor is mounted to the gearbox by a frame on v3s, you'll have to remove the whole gearbox, but you can definitely test for dead motor. The other thing that is possible is that the motor height is freakishly high and the motor just doesn't have enough power to turn over that much resistance.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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