View the thread, titled "Help with Kids Electric Quad 36V" which is posted in Electric Vehicles Advice Forum on Electricians Forums.

My son’s 36V quad bike has been converted to run of 2x18V drill batteries . It was all working fine until it stopped about 20 minutes into the ride, batteries still reading about 75%. Anyway re charged and now the motor /wheels run fine when I lift the back axle of the ground but as soon as it’s put back on the ground or he sits on it it doesn’t move. Output from batteries reads about 39v, input to motor 33.5v then when I pull the throttle it jumps to 39v but still no movement when under load. Could it be faulty controller or motor? Or is something more serious
Mechanically everything runs free and fine no obstructions
 
That's what it sounds like, although there's still a remote possibility that the motor is taking excess current, and the controller has electronic overload protection which was kicking in..
 
That's what it sounds like, although there's still a remote possibility that the motor is taking excess current, and the controller has electronic overload protection which was kicking in..
Thanks for your help, is there any way to check? It seems 39v at the battery and 39v at the controller when the throttle is on full so would guess that means it’s fine? But again Ive not idea .
 
Thanks for your help, is there any way to check? It seems 39v at the battery and 39v at the controller when the throttle is on full so would guess that means it’s fine? But again Ive not idea .
It more than likely has a controller that drives the motor using Pulse width modulation.
It sounds like a problem with the controller.
 

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Help with Kids Electric Quad 36V
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