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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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05-15-2015, 01:43 PM | #1 |
Not Yet Wild
Join Date: May 2015
Posts: 2
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1991 ezgo marathon speed issue
I have a 91 ezgo marathon giving me trouble. I bought it from a neighbor and the cart would die when the accelerator was pushed halfway down. It would go when I let up on the pedal. I changed out the potbox and that fixed that issue. Now the cart runs very slow. It ran much faster with before the potbox was changed. I'm thinking it might be the controller. How would I test that? Any other ideas? Thanks in advance...
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05-15-2015, 01:44 PM | #2 |
Not Yet Wild
Join Date: May 2015
Posts: 2
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Re: 1991 ezgo marathon speed issue
also...batteries are 6 months old.
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05-16-2015, 08:49 AM | #3 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1991 ezgo marathon speed issue
If the same controller ran the cart faster with the old pot-box than it runs it with the new pot-box, I'd check the new pot-box for proper adjustment.
Pull the black and white wire off the controller and measure between the two wires (not the terminals on the controller) with an Ohmmeter. Should be about 0Ω with pedal up and about 5,000Ω with pedal down. (In Reverse, it may only go to 2,500Ω if half speed reverse switch is connected.) To check if controller is wide open when pedal is on floor, measure the battery pack voltage when running flat out on level ground and then measure the voltage between the M- and B+ terminals on controller while doing same. They should be exactly the same if the controller is at 100% duty cycle. FWIW: The controller shuts off if it sees more the 7,000Ω between the black and white wires, so the old pot-box might have simply been out of adjustment. |
05-16-2015, 08:54 AM | #4 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,419
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Re: 1991 ezgo marathon speed issue
Another FYI is this - The cart had a 1/2 speed reverse option. The cart will be slow if you somehow have activated the 1/2 speed pot signal all the time.
The OEM pot had 2 sets of 2 wire leads. One set sent ohm signal to the control. Second set reduced that signal 50% when connected together. Measure the ohm output from the wires to the control... what do you get? |
10-28-2020, 03:29 PM | #5 | |
Not Yet Wild
Join Date: Oct 2020
Posts: 10
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Re: 1991 ezgo marathon speed issue
Quote:
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01-18-2022, 06:03 PM | #6 |
Not Yet Wild
Join Date: Dec 2015
Location: greenwood sc
Posts: 22
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Re: 1991 ezgo marathon speed issue
I’m having a similar problem , I’ve changed the solenoid , the pot box , the F&R board , cart still runs slow at first then quits, out of options , any suggestions?
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