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Electric Yamaha Electric Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



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Old 11-10-2021, 04:49 PM   #1
Soupman
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Yamaha
 
Join Date: Nov 2021
Location: Gulf coast
Posts: 6
Default No power

I have a 2012 G29 that I use almost daily. One day, no power. When I put the cart in run there's no click from the solenoid. I replaced the solenoid and found that I was not getting power from the small wires that control the it. I checked all switches and 3amp fuse, all good. I then replaced the controller to no avail.
All wiring looks good and the motor is only 6 months old.
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Old 11-10-2021, 06:11 PM   #2
Volt_Ampere
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Yamaha
 
Join Date: May 2012
Location: Rio Verde, Az
Posts: 4,306
Default Re: No power

Trace the 48V power from the + terminal on the contactor to the 3 amp fuse - then it goes to the run/tow switch then to the key switch. With the Run/Tow switch on, you should have battery voltage on the red/yellow wire on the key switch. When you turn on the key switch, you should get battery voltage on the red/white wire on the key switch. That will send battery voltage to the switch on the accelerator pedal. When you push the pedal, you should then get battery voltage on the brown wire coming from that switch. That wire tells the controller to energize the main solenoid. All voltages are measured relative to battery minus. The controller grounds the negative small terminal on the contactor to energize it. With the run/tow switch in run, the red/yellow wire on the small terminal on the solenoid should have battery voltage on it. The controller grounds the red/black wire on the negative small terminal on the solenoid to energize it.
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Old 11-12-2021, 06:11 PM   #3
Soupman
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Yamaha
 
Join Date: Nov 2021
Location: Gulf coast
Posts: 6
Default Re: No power

I have power to the Run/Tow switch but only about 3/4 (32V but varies). With switch in Run position I get very little power to the key switch and solenoid, usually about 3V and it dissipates to zero volts quickly and no power at all to the potentiometer or stop switches. The 3amp fuse looks good but just to make sure a jumped it and there was no difference. I have checked the entire wiring harness and visually it looks good. What next?
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Old 11-12-2021, 08:46 PM   #4
Volt_Ampere
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Yamaha
 
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Location: Rio Verde, Az
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Default Re: No power

If you are not getting full battery voltage to the run/tow switch and the fuse is good then you have a broken wire. Follow the wiring diagram and find the break.
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Old 11-15-2021, 03:01 PM   #5
Soupman
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Yamaha
 
Join Date: Nov 2021
Location: Gulf coast
Posts: 6
Default Re: No power

Okay, I now have power. I replaced the fuse holder and fuse. They were pretty corroded. New problem: When I press the accelerator, the solenoid clicks but the cart doesn't move. Also, no sound from reverse buzzer. Hopefully something much simpler than wiring.
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Old 11-30-2021, 03:30 PM   #6
Soupman
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Yamaha
 
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Location: Gulf coast
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Default Re: No power

Update: The cart still does not run.
Parts: New motor 3/21, new Tow/Run and Stop switches 11/21, new Navitas 440amp Controller 11/21.
I put the Tow/Run switch in Run, get a blinking green light on the controller. Turn key switch on, voltage meter comes on (51V) and a solid green light on the controller. Push accelerator pedal, solenoid clicks but cart doesn't move. Move switch to reverse, buzzer sounds, push pedal, again cart doesn't move. I then disconnected everything and tested the motor. Motor tested good.
I'm at a loss. Any help or suggestions will be appreciated.
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Old 11-30-2021, 03:54 PM   #7
ojo
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E-Z-GO
 
Join Date: Sep 2020
Location: Germany
Posts: 659
Default Re: No power

Have you checked with Navitas Dashboard / Diagnostic? Probably a problem with the throttle sensor, check the voltage of the TPS displayed in the App. I've had a similar situation, overhauled motor, new controller and no go. Finally i've found a bad connection at the TPS...
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Old 12-02-2021, 04:11 PM   #8
Soupman
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Yamaha
 
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Location: Gulf coast
Posts: 6
Default Re: No power

I did replace the TPS. The Navitas diagnostic simply says: Pedal On.
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Old 12-02-2021, 04:35 PM   #9
Bama Brad
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Default Re: No power

Lordy, Lordy...I sure hate to hear that you have broke the bank replacing all those components. Start at the battery negative and clean/inspect/replace all connections/cables that look bad using a wire brush. Continue all the way back to battery positive. You can (and have) spend a lot of money replacing things (guessing), when it could be a bad connection/cable. Little time can save a lot of money. This also gets you familiar with your cart and how it operates. Be sure to disconnect batteries when doing this. Look at the "Stickies" to see how to diagnose individual components.
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Old 12-02-2021, 06:43 PM   #10
ojo
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Default Re: No power

Quote:
Originally Posted by Soupman View Post
I did replace the TPS. The Navitas diagnostic simply says: Pedal On.
Just watching the Navitas diagnostic screen (demo mode):
Throttle Inputs
Throttle Voltage:
Foot Switch:

Pedal On means the foot switch but, do you see any voltage value when pedal is pressed?
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