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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV.



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Old 08-08-2017, 02:17 PM   #1
markm
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Default 93 Marathon will only go like 5mph

I have a 93 Marathon that will only top out at about 5mph.

Has new f/r and new throttle box. Battery pack is at 38.24 volts and drop to 37.64 at full throttle.

Could it be the controller?
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Old 08-09-2017, 06:34 AM   #2
markm
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Default Re: 93 Marathon will only go like 5mph

Bump

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Old 08-09-2017, 08:21 AM   #3
orangeman6
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Default Re: 93 Marathon will only go like 5mph

Hopefully you'll get some good help here soon. But in the meantime, have you checked all cables to see that they're not loose, damaged, corroded? Anything getting hot?

I'm not sure if there is a sticky above for the marathon, but that would be a good place to start.

Do you have a dvm?
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Old 08-09-2017, 08:23 AM   #4
markm
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Default Re: 93 Marathon will only go like 5mph

Yes I have a dvm just not sure what to test

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Old 08-09-2017, 08:46 AM   #5
orangeman6
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Default Re: 93 Marathon will only go like 5mph

The marathon is a series drive, correct?

Assuming all of your high amp cables are in good shape?

Here's the link to the "sticky" I was talking about. It should work for your marathon, correct?

http://www.buggiesgonewild.com/elect...agnostics.html


If the cart is going (even though very slowly) the low voltage side is working. You need to follow the path of the big cables, starting with the pack, and seeing where you're losing voltage.

Disclaimer *** I'm just repeating, hopefully correctly, what I've read here. However, I'd start with the tests in the sticky while you're waiting for help.
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Old 08-09-2017, 08:56 AM   #6
orangeman6
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Default Re: 93 Marathon will only go like 5mph

***current
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Old 08-12-2017, 01:30 PM   #7
markm
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Default Re: 93 Marathon will only go like 5mph

I did the testing and when putting the dvm leads on the B- and M- it says the voltage should drop to zero. I do not get that. I go from 38.10 to 24.5.

Does this sound like it needs a rebuilt controller?
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Old 08-12-2017, 10:21 PM   #8
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Default Re: 93 Marathon will only go like 5mph

Pull terminals 2 & 3 off controller, they will be black & white wires. Check them with the ohms scale on your meter that will cover the 5000 ohm range. You should get a low number when pedal is at rest (like 150), it should Increase smoothly to around 4700-5000 at full throttle. I'm thinking it may not be getting a full throttle signal.
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Old 08-13-2017, 12:20 PM   #9
markm
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Default Re: 93 Marathon will only go like 5mph

I get 207 at rest and 2332 at full throttle.

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Old 08-13-2017, 01:49 PM   #10
scottyb
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Default Re: 93 Marathon will only go like 5mph

This sounds like 1/2 speed reverse is activated all the time.
1/2 speed is active when ever the 2 wires going the the reverse micro switch are touching each other.... remove one wire from the switch and test the cart. If that fixes the cart them replace the micro switch or repair the wires.
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