Hello I am seeking advice on a 4x4 electric buggy I am making, basically from scrap electric wheelchair parts. The problem is front and rear motors are from different machines, and I need to make their 'road speed' the same, or the motors start to 'fight and scrub'. I have wired in a PWM to control all 4 motors (24volt DC brushed), this works OK but I need to somehow step down the rear motors power (voltage, I suppose) to get them at the same speed. Can I just wire in a second PWM in series using the first PWM output as supply voltage to the second PWM? I wonder if this would ensure running the same speed, at all voltages from the first PWM. I am unfamiliar with complex electronics, only have basic know how on this stuff. Ideally Im looking at an off the shelf device with easy wiring. Maybe there is a suitable 4-way motor speed controller with central speed controller? Hope this makes sense. Any advice most welcome Thankyou Matt W