The other day I was mudding and I went to lock the differentials on my new(used) 660 and when it locked the engine started sputtering, I’d seen that happen before on a short. The min I took it out of differential lock it ran normal. I’m going to check the wiring harness for short but any way to manually test the servo motors? I guess I could disconnect the motors and lock it and see if it does it still and would confirm if it’s the motor or wiring?? Any help or suggestions would be appreciated.