1984 Goldwing Interstate Charging system

Information and questions on GL1200 Goldwings (1984-1987)
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Posts: 17
Joined: Thu Mar 10, 2011 5:57 pm
Location: Tempe , Az
Motorcycle: 1984 GL1200 Interstate

1984 Goldwing Interstate Charging system

Post by cowboybob » Mon May 23, 2011 9:31 pm

Hi again.

I thought that someone might be able to come up with something that I had overlooked or didn't know about.

The bike is now charging a full 15 Volts when I start out. After a short time it starts to drop off. Seems that there is something about the heat that affects it. It will then charge just shy of 13 volts.
Then at times it seems to be running off of the battery.

Does the stator work at times and not at others? Seems to me that if it was the stator I would not be getting a charge at any time. Does the stator work when it feels like it. If was bad I would think that I would not get any voltage at all.

Hopefully that one of the 18 guys that have looked at my first note might have some idea that would help me.


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Posts: 54
Joined: Wed Apr 07, 2010 10:54 pm
Location: Warner Robins, Ga
Motorcycle: 1985 GL1200A ASPENCADE

Re: 1984 Goldwing Interstate Charging system

Post by joew7139 » Tue May 24, 2011 10:41 am

It sounds to me like your voltage regulator is working properly. When you first start the bike the charge voltage will be higher to replace the charge used to start the bike. After it runs for a while the battery does not need as much charge so the regulator cuts down on voltage to battery to prevent overcharging . Does the voltage to the battery increase if you raise the idle a little?

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Motorcycle: 1988 GL1500 I
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84 GL 1200 I

Re: 1984 Goldwing Interstate Charging system

Post by virgilmobile » Tue May 24, 2011 1:52 pm

You can measure the AC volts between each pair of yellow wires at the regulator when it's cold and working(2500 rpm) Run the bike till it quits,then re-measure the same wires(2500 rpm) to see if the stator is at fault. Also,there is a 12 volt DC switched wire that goes to the regulator.Measure it the same way.To be sure of what's happening,use a DVM taped to the false tank with wires run directly to the battery and watch the volts there.

Battery voltages can vary quite a bit,but I usually see 9-12 vdc(discharging)12.5-12.8 vdc static(no charge,no discharge)13-14.5 vdc(charging).

Charging current is more important than the specific voltage.The charging system is capable of some 30 amp maximum output.This current not only has to charge the battery but run the entire electrical system.So the actual charge rate to the battery will also vary.It can start at 20 amp and then taper off to 3 or 4 amp charge.

Here's a schematic to help.

Also ,If you haven't already,replace the dog bone fuse on the relay with a new automotive fuseholder and 30 amp fuse.

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