Alternator Output GL1100

Information and questions on GL1100 Goldwings (1980-1983)
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Location: Phoenix, Arizona
Motorcycle: 1983 GL1100I

Alternator Output GL1100

Postby volvot5 » Mon Sep 01, 2014 7:20 pm

I have noticed that my 1100 when in the summer. Were talking well over 100 degrees outside . With the engine at operating temperature. It Will start to misfire just a little at idle. When the cooling fan kicks in , it really starts to misfire until I get the idle to about 1500. I checked the voltage, when it's hot were talking being riden for at least an 12v at idle unless I raise it. when it's in the morning were talking 14.5 - 15v. So I'm wondering if somethings breaking down.Or if thats just how these are. Were talking temps out here to 115 sometimes higher in the summer.I found the junction for the yellow wires, all 3 were burnt in the connector. I spliced them together. I put my Amp meter on it The best I saw was maybe 10 amps at 3k rpm. at idle it's pushing 4-5 amps

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Motorcycle: 1981 Goldwing 1100
1989 Goldwing 1500

Re: Alternator Output GL1100

Postby jenagle » Mon Sep 01, 2014 8:11 pm

The 1100 alternator is seriously under-powered until about 2000 rpm (at least that's the way mine is). After that, is should put out about 14.5 volts. I installed a voltmeter in the left wing of my fairing so that I could monitor the output, and that is my experience.

When I got it, I had to clean the contacts in the connector, and continue to check it every off season.
Good luck.

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Re: Alternator Output GL1100

Postby WingAdmin » Tue Sep 02, 2014 3:49 pm

Heat can cause resistance in wires and connectors, as well as affect the battery operation. Sounds like when it is really hot, you are having your voltage drop, which will cause misfires - especially when there is significant voltage drop (i.e. fan kicks in).

I would do a test: Measure the voltage at the yellow wires when it is cool at a given RPM, then when it is hot and exhibiting this behavior, measure it again. That way you'll know if the issue is low voltage from your stator, or elsewhere in your electrical system. I suspect it is not the stator.

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