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



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Old 09-04-2020, 04:46 PM   #21
georgia088
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by Fallamaihn View Post
Now that I'm measuring off the correct B- terminal, I tested voltage again to M-. There is almost nothing when pedal is up. Then it jumps to full pack voltage when pedal is just pressed, and remains at full voltage pressing the pedal all the way to the floor.
Sounds like a bad controller. Only other thing it could be is throttle. I’m assuming this cart has ITS throttle. It’s located under mat on floor. There is a sticky in this forum that tells you how to check it.
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Old 09-04-2020, 07:29 PM   #22
JohnnieB
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Default Re: 1990 EZGO Solenoid Dead?

Here is the ITS stuff for a Series drive.
Attached Images
File Type: jpg ITS adj 1 of 2.JPG (63.8 KB, 0 views)
File Type: jpg ITS adj 2 of 2.JPG (52.6 KB, 0 views)
File Type: jpg ITS Voltage - 1.jpg (47.7 KB, 0 views)
File Type: jpg ITS Voltage - 2.jpg (48.2 KB, 0 views)
File Type: jpg ITS Voltage - 3.jpg (44.2 KB, 0 views)
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Old 09-05-2020, 01:58 PM   #23
Fallamaihn
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by JohnnieB View Post
Here is the ITS stuff for a Series drive.
Doesn't look like I have ITS. Appears to be a simpler potentiometer system?

I ran the B- to Controller Pin 2, and it reads about 4V when the pedal is pressed far enough to engage the solenoid.

B- to Pin 1 reads 4V before pressing the pedal and stays about the same as the pedal is pressed. It then goes down to 1.5V at full pedal.


Before the cart stopped working I had been doing some adjustment to the throttle linkage, as it was reading about 7600 Ohms with the pedal fully depressed. After my adjustment I got it down to about 5400 Ohms, and it ran fine for a couple days before it quit altogether.
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File Type: jpg IMG_20200905_132807.jpg (227.2 KB, 0 views)
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Old 09-08-2020, 08:52 AM   #24
Fallamaihn
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Default Re: 1990 EZGO Solenoid Dead?

It's definitely seeming more and more like a bad controller. What should the behavior of M- be? From the circuit diagram it looks like that's the terminal that needs to complete the circuit for current to flow, correct?

While messing around we ended up bridging B- and M- with the pedal pressed, and the cart moved, so at least it appears the motor is functioning.
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Old 09-08-2020, 09:59 AM   #25
JohnnieB
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Default Re: 1990 EZGO Solenoid Dead?

Quote:
Originally Posted by Fallamaihn View Post
It's definitely seeming more and more like a bad controller.

1. What should the behavior of M- be?

2. From the circuit diagram it looks like that's the terminal that needs to complete the circuit for current to flow, correct?

3. While messing around we ended up bridging B- and M- with the pedal pressed, and the cart moved, so at least it appears the motor is functioning.
1. B- to M- should be full battery pack voltage when pedal is pushed just far enough to make solenoid click and should smoothly decrease to 0V as pedal is slowly pushed to floor.

2. Yes. The speed control element (MOSFETs) is located between B- and M-.

3. That bypassed the controller.
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Old 09-08-2020, 11:22 AM   #26
Fallamaihn
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by JohnnieB View Post
1. B- to M- should be full battery pack voltage when pedal is pushed just far enough to make solenoid click and should smoothly decrease to 0V as pedal is slowly pushed to floor.

2. Yes. The speed control element (MOSFETs) is located between B- and M-.

3. That bypassed the controller.
Since I'm getting full pack voltage between B- and M- once pedal is pushed and remaining all the way to the floor, plus bypassing the controller makes it go... Sounds like the controller is faulty then? Any additional diagnostics I can do on the controller itself to make sure or should I start shopping?

Thanks again, appreciate all the guidance.
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Old 09-08-2020, 12:17 PM   #27
JohnnieB
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Default Re: 1990 EZGO Solenoid Dead?

Quote:
Originally Posted by Fallamaihn View Post
Since I'm getting full pack voltage between B- and M- once pedal is pushed and remaining all the way to the floor, plus bypassing the controller makes it go... Sounds like the controller is faulty then? Any additional diagnostics I can do on the controller itself to make sure or should I start shopping?

Thanks again, appreciate all the guidance.
Check the throttle again and see if it still is at about 0Ω with pedal up and roughly 5000Ω with pedal done.

If the controller is turned on and being told to pass amps to the motor, but isn't doing so, it is bad.
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Old 09-08-2020, 01:59 PM   #28
Fallamaihn
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by JohnnieB View Post
Check the throttle again and see if it still is at about 0Ω with pedal up and roughly 5000Ω with pedal done.

If the controller is turned on and being told to pass amps to the motor, but isn't doing so, it is bad.
Double checked and yes, very close to 0Ω with pedal up. 5400Ω when pressed to the floor.
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Old 09-08-2020, 07:11 PM   #29
JohnnieB
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by Fallamaihn View Post
Double checked and yes, very close to 0Ω with pedal up. 5400Ω when pressed to the floor.
Looks like the controller is being told top pass amps to the motor, biut isn't doing what it is being told.

Replace it with an Alltrax SR48400 or larger.
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Old 09-09-2020, 09:06 AM   #30
Fallamaihn
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Default Re: 1990 EZGO Solenoid Dead?

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Originally Posted by JohnnieB View Post
Looks like the controller is being told top pass amps to the motor, biut isn't doing what it is being told.

Replace it with an Alltrax SR48400 or larger.
Already ordered one yesterday! I'll let you guys know how it works out.
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