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



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Unread 02-16-2011, 06:31 PM   #1
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Default '90 Marathon

I Bought this 1990 Marthon for my dad to use around his lake house. The batteries are dead. So I swapped them out with the ones from my 2002 buggy.
The Marathon goes 10Mph (mine goes 20mph. different motor. different tires). But the Marathon goes 10Mph with the peddle about halfway down. I get nothing when pushing all the way down. My 2002 has speed through the whole peddle movement.
Is this normal, or is there something I can check? The buggie seems like something is holding it back (if that makes any since).

Thanks.
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Unread 02-16-2011, 07:56 PM   #2
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Default Re: '90 Marathon

bad potentiometer not reading a full 0 to 5k
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Unread 02-16-2011, 08:02 PM   #3
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Default Re: '90 Marathon

Thanks Marathon Man. i'm sad to say but i'm familiar with that. What does it do and where is it?
Is there a way to test it?


Thanks
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Unread 02-17-2011, 07:12 AM   #4
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Default Re: '90 Marathon

It is the silver box bolted to the side of the controller support (on the drivers side of the support). To test the output, pull the #2 and #3 wire from the controller (small spade connectors) attach a digital volt meter set to OHMs to the 2 wires and slowly press the pedal down until it hits the floor while watching the readings on the meter. You should see smooth flow from 0 to 5000 OHMs.
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Unread 02-17-2011, 12:16 PM   #5
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Default Re: '90 Marathon

OK, I trying to find a wiring diagram so I can tell what the
#2 and #3 wires are.
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Unread 02-17-2011, 12:24 PM   #6
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Default Re: '90 Marathon

The problem I have is that I'm using the nice Fluke meter with lots of options. I need dumbed down meters.
I finally got it right and found the #2,3 wires. There are 2 spots in trottle movement that the fluke read "OL". Completely depressed it reads 6.5. I'm not sure I have the Fluke setup right.
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Unread 02-18-2011, 06:21 PM   #7
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Default Re: '90 Marathon

Any other help on why this buggie only goes 10mph?
Does the info above on the potentiometer help?
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Unread 02-20-2011, 10:26 AM   #8
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Default Re: '90 Marathon

10mph isn't that far off of what that era cart is supposed to do. Don't like the blips in the pot throttle response and 6.5k ohms is a tad high but not so high as to shut down the controller. Brakes free? Motor been cleaned lately? Batteries fully charged and no weak cells? Cables all clean and tight? Just scatter shootin here....

For reference, that cart did maybe 12mph tops from the factory....
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