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



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Old 06-30-2011, 06:09 PM   #1
ezgovstar
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Angry Cart goes without input from accelerator

EZ GO Golf Cart Question:

I have a 1989 Marathon EZGO Golf Cart. I just replaced the batteries. I photographed how they were hooked up to ensure I got them reconnected right. I'm positive I have it done correctly.

However, after connecting the batteries, initially it wouldn't move. The backup alarm would sound if I flipped it into reverse, but no movement in either direction. After about a minute it started to go. I drove it around a bit and noticed that I could stop it, but as soon as I'd let my foot off the brake, it would start going. Turning the key on or off would not affect this condition. So I locked the brake to hold it still. That's when I discovered the resistor coil under the seat was now glowing red hot. I disconnected the batteries and the glowing stopped. After getting an electrical schematic from the internet, I traced all the wires to ensure they matched, and they did. I poked, pulled and prodded a bit trying occasionally to reconnect the battery. After a few surges to the motor, I tried connecting again after some more poking around and this time it didn't lurch forward.

I turned the key on and moved backward, then forward. I tried turning the key off and that, as expected, would disable the golf cart. Turning the key back on, I could again move. I stopped and took my foot off the brake (without locking it) and the cart would remain still. I returned to the house and put the cart on the charger. After about 7 hours on charge, I disconnected it and drove it around the house to put it in the garage. That's when I noticed that it wanted to go without input from the accelerator again. I continued to drive it around and turn the key on and off, switch from forward and reverse, press the accelerator, release it. Nothing I did changed the condition. So, being ready, I locked the brake and raised the seat and disconnected the battery.

So my question is; What is wrong with the cart?
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Old 06-30-2011, 07:23 PM   #2
scottyb
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Default Re: Cart goes without input from accelerator

2 things have to go wrong for this to happen. It is not uncommon, I am 100% sure of my diagnosis.
1. the solenoid is sticking closed or welded shut = cart always on
2. Accelerator wiper contact not returning to 'zero' or off position. Usually due to pitted and burnt contacts and wiper.

This is a serious problem, this is the type of scenario that will burn a cart to the ground and the house it is in with it.
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Old 06-30-2011, 07:40 PM   #3
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Default Re: Cart goes without input from accelerator

Quote:
Originally Posted by scottyb View Post
2 things have to go wrong for this to happen. It is not uncommon, I am 100% sure of my diagnosis.
1. the solenoid is sticking closed or welded shut = cart always on
2. Accelerator wiper contact not returning to 'zero' or off position. Usually due to pitted and burnt contacts and wiper.

This is a serious problem, this is the type of scenario that will burn a cart to the ground and the house it is in with it.
I don't doubt this at all. Coincidentally, I decided about 2 hours ago to order a new solenoid, so that is coming. I've looked very close at the wiper contacts and they appear to be in pretty decent shape, and it is certainly returning to 'zero'. So perhaps once the solenoid arrives my issues will be resolved. For now, the batteries remain disconnected, so I'm expecting no burned cart or home (since it's in my garage). Thanks for your response scottyb!
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Old 06-30-2011, 07:47 PM   #4
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Default Re: Cart goes without input from accelerator

At one point your throttle was not returning to zero as evidenced by the glowing red coil. So re-check the return spring and all movable throttle parts. Maybe lube them with spray grease, not WD40, just to be safe and operate the throttle ... especially check the throttle return from low or 10% application .
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Old 06-30-2011, 08:05 PM   #5
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Default Re: Cart goes without input from accelerator

Quote:
Originally Posted by scottyb View Post
At one point your throttle was not returning to zero as evidenced by the glowing red coil. So re-check the return spring and all movable throttle parts. Maybe lube them with spray grease, not WD40, just to be safe and operate the throttle ... especially check the throttle return from low or 10% application .
Unless we're talking about different things, I don't believe so. I've attached a photograph of the wiper and it's position. You can see it's at the lowest point, and the stud can be seen with no wires attached. I assume this is 'zero'. If I touch the battery cable to the battery, the cart, as it sits, will lurch forward. If I lock the brake, the resistor will glow.
Attached Images
File Type: jpg P1050625a.jpg (57.2 KB, 27 views)
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Old 06-30-2011, 10:52 PM   #6
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Default Re: Cart goes without input from accelerator

Something is wired wrong.

Notice in the pic the stud we call zero has no wire attached to it?> that should be OFF, period. Unless that stud has a bond with the next stud?????????

What other work has been done to the cart?
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Old 06-30-2011, 11:50 PM   #7
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Default Re: Cart goes without input from accelerator

Unless I am mistaken, the same post of the solenoid that has the wire running to the wiper arm also has a second wire running to the second stud up from the bottom. This was done to prevent arcing on the board. If the solenoid is welded shut, the car would want to creep since the voltage would be going through the system the same as if you had just barely pressed the pedal.
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Old 06-30-2011, 11:56 PM   #8
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Default Re: Cart goes without input from accelerator

Quote:
Originally Posted by rabbitreborn View Post
Unless I am mistaken, the same post of the solenoid that has the wire running to the wiper arm also has a second wire running to the second stud up from the bottom. This was done to prevent arcing on the board. If the solenoid is welded shut, the car would want to creep since the voltage would be going through the system the same as if you had just barely pressed the pedal.
Thanks Rabbit
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Old 07-02-2011, 11:34 AM   #9
ezgovstar
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Default Re: Cart goes without input from accelerator

Quote:
Originally Posted by scottyb View Post
Something is wired wrong.

Notice in the pic the stud we call zero has no wire attached to it?> that should be OFF, period. Unless that stud has a bond with the next stud?????????

What other work has been done to the cart?
Well, I took body panels off to repaint them. But so far as the electrical system, nothing. I did download the wiring diagram and verify that the cart is connected as it's shown. The accelerator contacts are a bit dirty, I'll get in there with a wire brush and some air and make sure nothing is touching the connect points together. But realistically, I've got my eggs in the solenoid basket. It should be here Monday, and I'll let ya know how that goes.
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Old 07-02-2011, 12:16 PM   #10
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Default Re: Cart goes without input from accelerator

I am fairly certain that once you replace the solenoid your issue will disappear. It happens quite often and it happens at random.... the only constant I have ever found in cases of welded shut solenoids wa MOST of the time people had run the carts with VERY low Pack voltages....
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