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Cushman Mini Mizer 3 wheel electrical car

4061 Views 1 Reply 2 Participants Last post by  Woodsmith
Hi guys! I'm new here on this discussion forum and hopefully some of you can help me out with a problem on my Cushman Mini Mizer

I will try to explain the problem
If you look at the wiring diagram (attachment) and follow the wire from the circuit breaker to the resistor mounting board, further through the two resistors and to the connection on the foot switch and lastly to the frame bracket there will be a connection to the motor. Indeed the resistor will cause a voltage drop, but still there will be a connection as far as I can see.
This connection will cause the motor to run as far as I can understand. My question is therefore: Assuming the ignition key is turned on, the gas pedal is in rear (off) position, I sit on my seat causing connection in the micro switch under the seat and the breaks are off. What will prevent the car from running? This is the theory (as far as I can see). And in real life this is what happens: My car will not stop when the gas pedal is in its rear (off) position. I have checked that the wiper contact is in its rear position on the speed control. Am I missing something or is the car not supposed to be able to stand still when the ignition key is on and someone is sitting on the seat?

If I drive the car with the speed control in its rear position, the resistors get pretty warm when driving only a few meters (too hot to touch them). I expected some heat generation on the resistors, but how warm are they supposed to be?

I would be very grateful if you could help out with my questions.

I have attached some pictures of my car, I think that will help you
identify my car


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Hi and welcome to the forum.

Looking at the diagram there is a micro switch next to the pedal switch that controls the speed range via the big wire resistors.

Is that switch attached to the pedal? It looks like it is a 'high' pedal switch that cuts off the solonoid when the pedal is not depressed.

Alternatively it could be the seat switch. Hard to tell in the diagram as it is not specific though there are some accessory switches in dashed lines.

The other altenative is tha the pedal, when it is not depressed, does not contact the lowest resistor setting.

The easy way to check is to put a volt meter on the motor wire and see if there is any voltage flowing to it when the pedal is not depressed.

The resistor wire will get hot as it is trying to dissipate whatever share of the power that is not going to the motor.
If you had a 1kW motor and the resisitor bank was limiting it to 500W, half power, then the other 500W would be disipated as heat in the resistor. That is quite a lot of heat!
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