Regulator/ Rectifier - Honda Goldwing Forums
 
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post #1 of 5 (permalink) Old 04-01-2019, 02:01 PM Thread Starter
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Regulator/ Rectifier

Hello

My Interstate 1984 suddenly charge 14,9 V
Anyone who can tell me about this?
I think the battery don`t like it
I read about it but I am not sure what to do, maybe I need a new rectifier?
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post #2 of 5 (permalink) Old 04-01-2019, 05:23 PM
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Black Wire Sensing Voltage -

Hey Sunburn - The Voltmeter on my 1200 GW will (very briefly) read +14.9 volts while at highway speeds but usually shows +13.5 - 14.2. How long does your bike's voltage read high and where is your test point ? Do you have a wiring diagram on your bike ? To help you troubleshoot your Voltage Regulator - Below is a simplified diagram and overview.

There are Three Yellow Wires (bottom Left Corner) coming out of the Stator Winding (Locatd Inside Rear Engine Cover), each wire produces an AC voltage that is rectified to DC and used to charge your battery and power the bikes electrics. The Red/White Wires (Upper Left) carry the rectified (DC) OutPut Voltage. The Green Wires (Bottom Right) Grounds the Regulator. The Black Wire (Upper Right Corner) is the Voltage Regulator "Sensing" input that tells the VR the Bikes Wiring Voltage. (Not Battery Voltage).....

If you are reading your bike's voltage at the small fuse box located on top of the air cleaner - it will read slightly LOWER than the voltage read directly across the battery (+/-) terminals. The difference (1-1.5 volts) is the result of losses in the (30 Year Old) ignition switch contacts and other wiring connections throughout the bike. The VR looks at the bikes wiring (Not The Battery) Voltage for it's sensing point. Depending on the Resistance within the wiring harness, the VR will sometimes temporarily flare it's Output Voltage higher than normal. Naturally if the VR holds the Voltage near +15 Volts continuously there is a problem and it can damage the Stator Winding and the Battery.

A good VR Performance Test is to jumper the "Black Sensing" wire directly to the battery, if your voltage reading is still over charging - your regulator is defective.

Good Luck - Michael
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Last edited by JK McDonald; 04-01-2019 at 05:33 PM.
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post #3 of 5 (permalink) Old 04-03-2019, 11:49 AM
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Voltage Regulator - Test

Hey Sunburn - Did this information help you sort out your problem ? If my suggestion on how to test your Voltage Regulator burned your bike to the ground - I don't know who this JK McDonald guy is .....

Ride Safe - Michael
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post #4 of 5 (permalink) Old 04-03-2019, 12:30 PM Thread Starter
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To JK McDonald, did you get my messages?
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post #5 of 5 (permalink) Old 04-03-2019, 03:19 PM
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Voltage Regulator Troubleshooting -

Hey Sunburn - I did find your message about one side of your saddlebags being disconnected. This may cause a slight difference in the electrical load but I doubt if it would cause a significant difference in the charging voltage.

In your second message, you mentioned reading a constant +14.9 Volts at the terminals of your battery . Did you cut the black sensing wire going to the Voltage Regulator and temporarily connecting it to the Positive post of the battery ?

1 If the charging voltage is still +14.9....... the Voltage Regulator is defective.

OR

2 If the charging voltage is now (approximately) +13 volts ...... the Voltage Regulator is working fine and you have a voltage drop somewhere in your wiring harness. Often one of the contacts inside the ignition switch.

The Voltage Regulator on a 4 cylinder Goldwing does occasionally fail. If you do need one, they are available very reasonably priced on Ebay. Here is an example.....

https://www.ebay.com/itm/Voltage-Rec...wAAOSw379cbEh6

Please keep us posted on your progress -
Good Luck - Michael

Last edited by JK McDonald; 04-03-2019 at 03:23 PM.
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