Electric problems

[bryantma]

Hi,

After playing with the nitro cars for a while, I've now given the kids electric off road cars (Midnight Pumpkins). However, I am now having problems with one of these.

Sometimes it works wonderfully, but about 50% of the time it doesn't. When it doesn't, it will run fine for 30 seconds and then the forward and reverse will stop working properly.

At at anything above 10% power it will give power for half a second and then stop. Half a second later it'll do that again. The speed controller has a little lamp that flashes each time it does this.

The setup for the speed controller has been done. I have two batteries that do exactly the same and a volt meter tells me that the batteries are good.

During running the voltage drops to 5.5v or so and when at idle returns to 7.1v. When the car is doing its little dance the voltage is constantly bouncing between 4v and 6v, but it's kinda difficult to read.

The steering works well at all times.

Anyone had this before? Any ideas? :surrender

Martin

 

[HeartBreak]

If you have the stock white Tamiya connectors, you may want to change those. If they look alright, perhaps try a different battery pack.

Failing those steps, the ESC could be hosed. Or the motor could be bound up. Try checking to see if the car rolls smoothly in both directions.

Aside from that, it sounds like a bad connector on the battery-esc connection.

There is a real long shot, and that could be the controller is damaged. Try switching ESC's in the cars and see if the issue goes away.

Let us know what you find out.

 

[abadk9420]

what kind of esc do you have in those trucks and are they all stock? or do you have mod motors in them or stock? like HeartBreak said tamiya plugs suck and can cause problems also make sure all of your wires are free of any cuts where they might be shorting out like on your battery in, motor out, power switch, wire going to your receiver, if you can you might want switch all of your conecters to Deans Ultra plugs, tamiya plugs tend to over heat and even melt together I know this from first hand experiance, good luck...

 

[bryantma]

I've tried everything hat I could. All connectors seem OK and all parts are stock. In the end I took it back to the shop and we tried replacing the speed controller and various other bits without success. I would guess that the main suspect is now the motor, but the guy is holding it and he will try replacing every part, one at a time to see what gives.

I'll post the answer here once I have one.

Martin