81 gl1100 not enough voltage


Information and questions on GL1100 Goldwings (1980-1983)
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dbutler440
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Motorcycle: 1981 goldwing gl1100 interstate

81 gl1100 not enough voltage

Postby dbutler440 » Fri Mar 11, 2011 12:37 pm



i have a 81 gl100 and it is only putting out 11.5 volts at battery running at 2500 rpm.could this problem be the rectifier or the stator.any help would be greatly appreciated!



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thrasherg
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Re: 81 gl1100 not enough voltage

Postby thrasherg » Fri Mar 11, 2011 3:10 pm

There are a ton of topics on this, use the search feature, It could be the alternator, the regulator or the 3 pin plug between the alternator and regulator. Until you run some basic tests you will not know which is faulty..

Gary

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WingAdmin
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Re: 81 gl1100 not enough voltage

Postby WingAdmin » Fri Mar 11, 2011 3:48 pm

First - does the voltage change at ALL if you rev the engine to a higher RPM? What does it show at idle?

dbutler440
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Location: paducah,kentucky
Motorcycle: 1981 goldwing gl1100 interstate

Re: 81 gl1100 not enough voltage

Postby dbutler440 » Fri Mar 11, 2011 5:29 pm

at idle it is putting out 11.5. at 2500 rpm it is putting out 11.7 or 11.8 volts. checked the 3 wires from stator and connector really doesnt look bad.someone told me the regulator.how do you check it?

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thrasherg
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Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: 81 gl1100 not enough voltage

Postby thrasherg » Fri Mar 11, 2011 5:55 pm

The easiest thing is to disconnect the 3 pin connector between the alternator and regulator, take a volt meter and measure the AC voltage coming out of the alternator. You will have 3 wires from the alternator and 2 wires on your multimeter. If you number the wires 1, 2 & 3 take your multimeter and measure the voltage between wires 1 & 2, it should read more than 40 volts, then measure the voltage between wires 2 & 3, again it should measure very similar to the voltage across wires 1 & 2, then finally measure the voltage across wires 1 & 3, again it should be very similar to your prior readings. If all 3 combination's give a similar voltage, then the alternator is working. If you have no voltage, or only volts on some of the 3 combination's, then the alternator has failed. If you are getting the 40+ volts on all 3 combination's of wires then either your regulator is faulty, or the wiring from the regulator or the wiring from the regulator to the battery is faulty. The engine has to be running when you take the voltage measurements and it would be good to have the engine reving at around 2500RPM. This will give us a good starting point. If your multi meter can also read resistance, it would be good to check the resistance between wires 1 & 2, 2 & 3, and 1 & 3. It should be a low resistance (a few ohms), then check that you have no connection (Very high resistance) between wire 1 and the -ve battery terminal, very high resistance between wire 2 and the -ve battery terminal and again very high resistance between wire 3 and the -ve battery terminal. That will prove that all 3 phases of the alternator are not damaged and you have no shorts to ground inside the alternator.

Gary

dbutler440
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Joined: Fri Mar 11, 2011 12:26 pm
Location: paducah,kentucky
Motorcycle: 1981 goldwing gl1100 interstate

Re: 81 gl1100 not enough voltage

Postby dbutler440 » Fri Mar 11, 2011 6:31 pm

thank you! i will try that and post results.

dbutler440
Posts: 6
Joined: Fri Mar 11, 2011 12:26 pm
Location: paducah,kentucky
Motorcycle: 1981 goldwing gl1100 interstate

Re: 81 gl1100 not enough voltage

Postby dbutler440 » Fri Mar 11, 2011 6:48 pm

tested the 3 wires.getting nothing on voltage. do i test it on ac or dc.if it wasnt putting anything out from the stator would it still be putting some voltage to the battery?when i rev the motor up the headlight does get brighter.should i still hard wire where the plug is.heard that is a bad point with them.

dbutler440
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Motorcycle: 1981 goldwing gl1100 interstate

Re: 81 gl1100 not enough voltage

Postby dbutler440 » Sat Mar 12, 2011 12:27 pm

ok finally figured out the test for stator.between 1 and 2 it read 50 volts.between 2 and 3 it read 50 volts.between 1 and 3 it has no voltage.

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WingAdmin
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Re: 81 gl1100 not enough voltage

Postby WingAdmin » Sat Mar 12, 2011 8:30 pm

thrasherg wrote:If your multi meter can also read resistance, it would be good to check the resistance between wires 1 & 2, 2 & 3, and 1 & 3. It should be a low resistance (a few ohms), then check that you have no connection (Very high resistance) between wire 1 and the -ve battery terminal, very high resistance between wire 2 and the -ve battery terminal and again very high resistance between wire 3 and the -ve battery terminal. That will prove that all 3 phases of the alternator are not damaged and you have no shorts to ground inside the alternator.


Make sure that when you read the resistance of your stator coils that the engine is turned off!!! Otherwise you will find it very quickly destroys your multimeter! :)

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WingAdmin
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Posts: 17050
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: 81 gl1100 not enough voltage

Postby WingAdmin » Sat Mar 12, 2011 8:31 pm

dbutler440 wrote:ok finally figured out the test for stator.between 1 and 2 it read 50 volts.between 2 and 3 it read 50 volts.between 1 and 3 it has no voltage.


That's your problem, then. Unfortunately, it appears that your stator has failed. You can examine the yellow wires that run between the regulator and the stator to ensure they are intact, but chances are you're going to have to pull and replace the stator itself.

dbutler440
Posts: 6
Joined: Fri Mar 11, 2011 12:26 pm
Location: paducah,kentucky
Motorcycle: 1981 goldwing gl1100 interstate

Re: 81 gl1100 not enough voltage

Postby dbutler440 » Sat Mar 12, 2011 8:44 pm

i was not looking forward to hearing that!thank you to everyone that has provided information to help me with this problem.so now here comes the fun part!definitly want to get it back running though.it only has 68000 miles on it and it is in pretty good shape.getting a little warmer here and ready to ride!




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