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Old 08-09-2019, 10:50 PM   #1
Bray6092
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Default Yamaha G29 controller

I have negative battery pack on key switch.

Could this be anything but a controller malfunction
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Old 08-10-2019, 12:32 AM   #2
cgtech
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Default 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.
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Old 08-10-2019, 05:22 AM   #3
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Default Re: Yamaha G29 controller

I’ll check that. I thought I read it came from pin 8 on the 26 pin plug.
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Old 08-10-2019, 05:42 AM   #4
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Default 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.
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Old 08-10-2019, 02:36 PM   #5
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Default Re: Yamaha G29 controller

Could this be anything other than controller?
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Old 08-12-2019, 06:04 AM   #6
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Default 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.
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Old 08-12-2019, 05:31 PM   #7
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Default 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.
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Old 08-13-2019, 07:29 AM   #8
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Default 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.
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Old 08-13-2019, 04:20 PM   #9
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Default Re: Yamaha G29 controller

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.
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Old 08-14-2019, 08:24 AM   #10
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Default 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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