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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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12-02-2018, 07:06 PM | #1 |
Not Yet Wild
Join Date: Dec 2018
Posts: 6
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1992 EZGO Marathon 36V Cart
Hey everyone, I am new to the forum and new to golf carts. I am however versed in DC/AC current and troubleshooting, I spent 20 years in the Air Force working of aircraft. Bought what I think is a 1992 EZGO marathon, 36V (6 6V batteries.) Batteries were dead, charged two at a time in series and got pack voltage up over 30V dc. Found out my charger was NOT dead and it kicked on and started doing it's thing but my batteries are toast. The question I have is this: From the controller, the cable is labeled B- at the controller however, the other end of that cable is labeled BL-. From the wiring diagrams I looked at, it appears it goes to the "master" negative on the RIGHT side of the cart. So is the control voltage for the controller 36v DC or ? The cart try's to move when the pedal is depressed etc but the BL- label has me confused. If hooked up on the left, the controller would only get 6V DC but if hooked up according to the diagram on the master negative, it would get 36V DC which I think is correct but just want to verify. I look through the forum but nothing that specifically addresses this question but if I missed it I apologize in advance.
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12-03-2018, 12:48 PM | #2 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZGO Marathon 36V Cart
FAA AC43-213A does not apply.
Never trust a label, especially in an old golf carts. The battery pack's main negative terminal in the Marathon moved from side to side over its production run and through the transition from the resistor drive to a controller drive, but B- has always been the most negative point and B+ the most positive point and there was 36V (nominal) between them that powered the motor. Sometimes, the 36V battery pack was tapped for 6V for the reverse beeper during the era a 6V beeper was used and for 12V to power lights and other accessories. Tapping the battery pack is a bad idea since it reduces battery life of the whole pack. The bottom line is that the six 6V batteries in the battery pack can be interconnected in any way that produces 36V and then connected to supply 36V to the motor via the controller and F/R switch assembly. BTW, I taught troubleshooting at Sheppard. (School of Health Care Sciences, BMET course.) |
12-03-2018, 06:39 PM | #3 |
Not Yet Wild
Join Date: Dec 2018
Posts: 6
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Re: 1992 EZGO Marathon 36V Cart
Thanks for the info. Everything appears to be hooked up correctly then. When I got the cart someone had the leads reversed on the last battery in the series on the right side of the cart. With that being said, I swapped them around the correct way. The just sat the battery in 180 degrees opposite of what is should have been and hooked up the cables, not paying attention to pos and neg. It appears that nothing got hurt but the batteries of course are toast since they likely never got charged after new due to the wiring error. I was able to get the pack voltage up to around 35V and it tries to move a few inches but the cells are just toast from sitting in discharge for years.
In regard to Sheppard, I went there for 7 Lvl school one time, I was a Weapons Specialist and went to tech school at Lowery back in late 92. I got hurt in 2011 and retrained to 4A and worked here at Little Rock until I retired. William Mitchell was one of our BMET's here, maybe you know him. |
12-03-2018, 08:34 PM | #4 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZGO Marathon 36V Cart
The carts are fairly simple machines, but it is easy to lose track of what goes where and cart owners have been known to do strange things.
Electrically, the drive system is basically three series circuits: high current, solenoid activation and throttle. So troubleshooting is straightforward, the symptoms alone often point to which of the three has a problem and then it is just a matter to troubleshooting a long piece of wire with a few lumps in it. Batteries are expensive, so when you get a new set, charge them prior to first use, break them in gently and recharge after each use. ----------- The name sounds familiar, but served from 1963 to 1975, so everybody I knew/met probably would have parted ways with the AF by Y2K or before. I started out in ground radio, went into Security Service (Comint, Sigint and Elint stuff, rather than cops), then cross trained into medical equipment and finally teaching medical equipment. A head hunter made me an offer I couldn't refuse, so I called it quits for better pay and benefits. |
12-03-2018, 09:34 PM | #5 |
Not Yet Wild
Join Date: Dec 2018
Posts: 6
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Re: 1992 EZGO Marathon 36V Cart
You were way early to know Mitchell, he is still active duty. In regard to the cart, just bought some batteries today and will pick them up in the morning. the cart had US batteries in it but I went with the Duracell (Deka) batteries from batteries plus. They had them on sale for $99 plus 10% off for online ordering for store pick-up. A little less AH than the US but will work for me. Hopefully once I hook them up and charge to full I will have no issues.
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12-05-2018, 10:27 AM | #6 |
Not Yet Wild
Join Date: Dec 2018
Posts: 6
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Re: 1992 EZGO Marathon 36V Cart
So it ended up just being bad batteries. Had decent voltage but no balls. Installed a new set yesterday and did initial charge and she is running like new. Not bad for a $240 golf cart.
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12-05-2018, 04:50 PM | #7 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 1992 EZGO Marathon 36V Cart
I don't know if ADA applies to you (you mentioned getting hurt and having to crosstrain), but you have also acquired a OPDMP (Other Power-Driven Mobility Device) for $240 (plus a new set of batteries).
The DoJ brochure is attached. (I keep a copy of it in my golf cart) |
12-05-2018, 06:56 PM | #8 |
Not Yet Wild
Join Date: Dec 2018
Posts: 6
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Re: 1992 EZGO Marathon 36V Cart
Thanks for the info. This does apply to me, I am 100% disabled through the VA and also have handicap placards. I really appreciate you.
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