Overvoltage problem


Information and questions on GL1200 Goldwings (1984-1987)
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Damgaard
Posts: 35
Joined: Tue May 21, 2013 11:15 am
Location: Denmark, Tonder 4 km from the Danish/German border
Motorcycle: GL 1200 Aspencade 1985

Overvoltage problem

Postby Damgaard » Tue Oct 21, 2014 9:04 am



I have replaced the old stator by not the voltage regulator. With no lights on the voltage is 13.5V to 14.4V but with headlight switched on the voltage rises to 14.8V - 15.3V. Is it possible to lower the voltage... I have checked the grounding on the regulator unit...



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virgilmobile
Posts: 7646
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Overvoltage problem

Postby virgilmobile » Tue Oct 21, 2014 9:33 am

You may have a bit more voltage drop feeding the regulator module than is tolerable.
Look of any corrosion at the regulator plug first.
If its clean....
Use a DVM.connect the black meter lead to the positive post of the battery...connect the meter red lead to the black wire at the regulator.
Start the bike.You should see no more than 0.5 volts on the meter with all the lights on.
If its 0.7 or above,the regulator tries to bump up the voltage to compensate for the voltage drop.
On my 84,I had battery volts in excess of 15.5 volts.
I did add a relay into the circuit to apply battery volts direct to the regulator black wire to eliminate the voltage drop.
I cut the harness wire loose and used it to click the relay the fused a wire from the battery post,feeding the switch of the relay and the output of the relay going back into the regulator.

User avatar
virgilmobile
Posts: 7646
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Overvoltage problem

Postby virgilmobile » Tue Oct 21, 2014 9:44 am

Here's a post of what I did to my bikes to stabilize the charging system....
viewtopic.php?f=5&t=12522

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WingAdmin
Site Admin
Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Overvoltage problem

Postby WingAdmin » Wed Oct 22, 2014 10:23 am

Agreed, voltage drop on the sense wire causes the regulator to put out too much voltage. Additional voltage drop due to the headlight drawing more causes the regulator to put out even more.




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