Yamaha G29 controller

Bray6092 · 08-09-2019, 10:50 PM

I have negative battery pack on key switch.

Could this be anything but a controller malfunction

cgtech · 08-10-2019, 12:32 AM

Well, since the key switch gets its power from the Tow/run switch, not the controller, I would check that tow/run circuit.

Bray6092 · 08-10-2019, 05:22 AM

I’ll check that. I thought I read it came from pin 8 on the 26 pin plug.

Bray6092 · 08-10-2019, 05:42 AM

I have positive full battery pack at the tow switch. I recheck key switch and I definitely have negative full battery back at the key switch.

Bray6092 · 08-10-2019, 02:36 PM

Could this be anything other than controller?

biphase · 08-12-2019, 06:04 AM

I saw that you were reading a "negative" voltage at the key switch. That is not possible if your reference point is B- . Put the black lead of your voltmeter on B- at the battery pack and leave it attached there. Use the red lead to make all measurements. With the key "on", you should see +48V on both the red/yellow wire and the red/white wire on the key switch. The red/white wire goes from the key switch to pin 8 on the controller.

Bray6092 · 08-12-2019, 05:31 PM

Sorry I wasn’t clear. I have zero volts. But if I move the lead from neg battery to the positive one I have full voltage.

biphase · 08-13-2019, 07:29 AM

Make all voltage measurements with the black lead attached to B-

The red/yellow wire on the key switch comes directly from the output side of the tow/run switch. When the tow/run switch is in "run" you should have +48V on both sides of the tow/run switch and also on the red/yellow wire at the input side of the key switch.

Bray6092 · 08-13-2019, 04:20 PM

I have zero volts

I have full battery pack going into tow switch and at the run post of tow switch I have two
Spliced wires connected which have a negative charge.

biphase · 08-14-2019, 08:24 AM

When the tow/run switch is closed in the "run" position, both posts of the switch are connected together. Therefore, you should read the same voltage on both sides. If not, the tow/run switch is bad.

08-09-2019, 10:50 PM	#1
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460	Yamaha G29 controller I have negative battery pack on key switch. Could this be anything but a controller malfunction
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460

08-10-2019, 12:32 AM	#2
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: Yamaha G29 controller Well, since the key switch gets its power from the Tow/run switch, not the controller, I would check that tow/run circuit.

08-10-2019, 05:22 AM	#3
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460	Re: Yamaha G29 controller I’ll check that. I thought I read it came from pin 8 on the 26 pin plug.
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460

08-10-2019, 05:42 AM	#4
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460	Re: Yamaha G29 controller I have positive full battery pack at the tow switch. I recheck key switch and I definitely have negative full battery back at the key switch.
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460

08-10-2019, 02:36 PM	#5
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460	Re: Yamaha G29 controller Could this be anything other than controller?
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460

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08-12-2019, 06:04 AM	#6
biphase Gone Wild Join Date: Jan 2009 Location: Ocala, FL Posts: 384	Re: Yamaha G29 controller I saw that you were reading a "negative" voltage at the key switch. That is not possible if your reference point is B- . Put the black lead of your voltmeter on B- at the battery pack and leave it attached there. Use the red lead to make all measurements. With the key "on", you should see +48V on both the red/yellow wire and the red/white wire on the key switch. The red/white wire goes from the key switch to pin 8 on the controller.

08-12-2019, 05:31 PM	#7
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460	Re: Yamaha G29 controller Sorry I wasn’t clear. I have zero volts. But if I move the lead from neg battery to the positive one I have full voltage.
Bray6092 Gone Wild Join Date: Apr 2015 Posts: 460

08-13-2019, 07:29 AM	#8
biphase Gone Wild Join Date: Jan 2009 Location: Ocala, FL Posts: 384	Re: Yamaha G29 controller Make all voltage measurements with the black lead attached to B- The red/yellow wire on the key switch comes directly from the output side of the tow/run switch. When the tow/run switch is in "run" you should have +48V on both sides of the tow/run switch and also on the red/yellow wire at the input side of the key switch.

08-14-2019, 08:24 AM	#10
biphase Gone Wild Join Date: Jan 2009 Location: Ocala, FL Posts: 384	Re: Yamaha G29 controller When the tow/run switch is closed in the "run" position, both posts of the switch are connected together. Therefore, you should read the same voltage on both sides. If not, the tow/run switch is bad.

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