Carts suddenly stops

[Nathandi2468]

While driving along if you let off the gas and then press it again sometimes the cart won’t go. If you depress the brake all the way and then hit the gas it works again. The cart never stops working as long as you have the pedal pushed. It’s only when you let off the gas at an intersection or around a corner that it stops working. Then you simply depress the brake all the way and then take off again.
Its a late 90’s ezgo txt with a lift and 23x10.5-12 wheels/tires. The controller is a Curtis 36v 350 amp. The wires have been upgraded to 2 gauge.
Any ideas what could be causing this????


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[bronsonj]

I'm wondering if it is going into thermal shutdown and depressing the brake all the way just gives it enough time to reset and really has nothing to do with the brake so much as the time it takes to depress?

[Nathandi2468]

Originally Posted by bronsonj

I'm wondering if it is going into thermal shutdown and depressing the brake all the way just gives it enough time to reset and really has nothing to do with the brake so much as the time it takes to depress?

I’m not familiar with thermal shutdown. If that’s it would I be able to drive it for as long as I want as long as I don’t let off the gas pedal? That’s the only time it stops working is if I let off the pedal. Otherwise it will go as long as I want.

[cgtech]

Have a diode on your solenoid? I've seen controllers do funny things without one. Diode should "theoretically" not be absolutely required, but I've seen odd, unexpected things on carts without one.

[Nathandi2468]

I do have a diode. It’s so strange.... I rode it around that evening for about 45 min and twice when I let off the pedal it died. I just depress the brake all the way and then hit the gas pedal and I’m back in action. A few people have suggested it may be overheating but it only dies if I let off the gas and will immediately go again once I hit the brake and it I don’t let off the gas it seems it will run until the battery dies. I’m at a loss

[bronsonj]

Originally Posted by Nathandi2468

I’m not familiar with thermal shutdown. If that’s it would I be able to drive it for as long as I want as long as I don’t let off the gas pedal? That’s the only time it stops working is if I let off the pedal. Otherwise it will go as long as I want.

Well then it's not thermal shutdown. Thermal shutdown is when the controller stops because it overheated. If you can drive it without issue as long as you want until you let off the GO pedal, then it's not thermal shutdown.

[Nathandi2468]

I just have no idea what is causing it. I guess I’ll have to take it to a shop. Last time I took it to a shop they charged me over $300 and when I got it back it was still doing it. They took it back to their shop and worked on it some more and it’s still doing the exact same thing. I appreciate all the input. Was hoping for a miracle answer[emoji1]


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[Threeput]

The diode is there to discharge the induced voltage caused by the collapsing field when the solenoid is switched off...this induced voltage polarity is in reverse to the direction of current that caused it in the first place (lenz's law)...hence the diode is wired neg lead to pos coil terminal on the solenoid