[RCP57]

I'm not sure what would cause the voltage drop. I know that happens with my Volvo occasionally because the slew ring I made doesn't always make good contact but I doubt a wiring connection is your problem. I have learned the hard way though that it takes a tremendous amount of power to turn a heavy model on grass or carpet. You may find that your motors are just not up to snuff. The machine looks awesome though and seems to function perfectly on smooth concrete so I'm sure if you can up the power somehow it will be fantastic!

Reg