Ezgo 93 marathon controller questions

Fatboy7112 · 03-27-2021, 10:18 PM

Hello all, new to the forum but I have got some great advice off of here throughout the past year. Having some issues with my 93 Ezgo Marathon. The forward reverse switch got to hot and the cart would only go in reverse, while troubleshooting that the solenoid quit working. Replaced both of those and still the cart won't run. I ran the test that I circled in the photo I attached. Where do I go from here. Does that test show I need a new controller? The cart is lifted, if I need a new controller what would you all recommend? 36v Ezgo Marathon and I posted the controller picture as well.

JohnnieB · 03-28-2021, 05:18 PM

That isn't the most informative test in the world.

It tells you there is no output from the controller, but doesn't help you narrow down the problem.

Try measuring between the controller's B- and M- terminals instead of between its M- and B+ terminals.

You should get full battery pack voltage (38.2V if fully charged) when the pedal is pushed just far enough to make solenoid click. If you don't get the voltage, use the red test lead that was on the B+ terminal to go looking for it. F/R switch is the most likely suspect.

Fatboy7112 · 03-28-2021, 06:37 PM

So I did the test you recommended, it had full battery pack voltage When I pressed the pedal. I did replace the f/r switch and it still won't move. The solenoid clicks as well. Is it possible the new F/R is bad or hooked up incorrectly?

JohnnieB · 03-28-2021, 07:24 PM

Quote:

Originally Posted by Fatboy7112

So I did the test you recommended, it had full battery pack voltage When I pressed the pedal. I did replace the f/r switch and it still won't move. The solenoid clicks as well. Is it possible the new F/R is bad or hooked up incorrectly?

If you get pack voltage, then the F/R switch contacts are forwarding voltage like they are supposed to. The speed control valve is located between the B- and M- terminals and should be the only open in the high amps circuit, so the full applied voltage will drop between them if the high amp cables, connections and contacts are intact.

You get the voltage, so slowly press the pedal to the floor and the voltage ought to smoothly decrease to 0V.

If it doesn't, either the controller or throttle is bad.

Fatboy7112 · 03-29-2021, 07:31 PM

Sorry but a bit confused, what is my multimeter connected too for the last test you recommended. Thanks

JohnnieB · 03-29-2021, 07:36 PM

B- to M-

Full pack voltage when solenoid first clicks and decreases to zero as pedal is pushed to floor.

Fatboy7112 · 03-29-2021, 08:22 PM

Okay I did that and it did not go to Zero. Thanks for the clarification. I did test the potentiometer and it tested good, so it must be the controller?

JohnnieB · 03-30-2021, 10:48 AM

Quote:

Originally Posted by Fatboy7112

Okay I did that and it did not go to Zero. Thanks for the clarification. I did test the potentiometer and it tested good, so it must be the controller?

If the pot went from zero up to about 200Ωwhen pedal was up and from about 4500Ω to about 5500Ω with pedal down, the controller is most likely bad.

Fatboy7112 · 03-30-2021, 06:33 PM

Thank you for all your help. I appreciate it.

JohnnieB · 03-30-2021, 07:14 PM

03-28-2021, 05:18 PM	#2
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: Ezgo 93 marathon controller questions That isn't the most informative test in the world. It tells you there is no output from the controller, but doesn't help you narrow down the problem. Try measuring between the controller's B- and M- terminals instead of between its M- and B+ terminals. You should get full battery pack voltage (38.2V if fully charged) when the pedal is pushed just far enough to make solenoid click. If you don't get the voltage, use the red test lead that was on the B+ terminal to go looking for it. F/R switch is the most likely suspect.

03-28-2021, 06:37 PM	#3
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8	Re: Ezgo 93 marathon controller questions So I did the test you recommended, it had full battery pack voltage When I pressed the pedal. I did replace the f/r switch and it still won't move. The solenoid clicks as well. Is it possible the new F/R is bad or hooked up incorrectly?
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8

03-29-2021, 07:31 PM	#5
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8	Re: Ezgo 93 marathon controller questions Sorry but a bit confused, what is my multimeter connected too for the last test you recommended. Thanks
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8

03-29-2021, 07:36 PM	#6
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: Ezgo 93 marathon controller questions B- to M- Full pack voltage when solenoid first clicks and decreases to zero as pedal is pushed to floor.

03-29-2021, 08:22 PM	#7
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8	Re: Ezgo 93 marathon controller questions Okay I did that and it did not go to Zero. Thanks for the clarification. I did test the potentiometer and it tested good, so it must be the controller?
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8

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03-30-2021, 06:33 PM	#9
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8	Re: Ezgo 93 marathon controller questions Thank you for all your help. I appreciate it.
Fatboy7112 Not Yet Wild Join Date: Mar 2021 Posts: 8

03-30-2021, 07:14 PM	#10
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: Ezgo 93 marathon controller questions

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