Voltage Adjustment?


Information and questions on GL1500 Goldwings (1988-2000)
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mraven
Posts: 13
Joined: Wed Mar 21, 2012 8:27 pm
Location: Moorhead, MN
Motorcycle: 2004 GL1800

Voltage Adjustment?

Postby mraven » Mon Jul 14, 2014 6:22 pm



I recently purchased a 91 1500. The voltage at idle is 11.75 (about 850 rpm), with a weak battery. Does the battery need to be fully charged for an accurate reading? Also, is there an adjustable voltage regulator?

Thanks,
Mark



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virgilmobile
Posts: 7647
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: Voltage Adjustment?

Postby virgilmobile » Mon Jul 14, 2014 9:26 pm

Not adjustable.
When weak,a battery is drawing a lot of current trying to recharge.this will lower the voltage a bit.Especially at a idle.
I do notice on mine,after cranking and just idling,the battery volts can be as low as 12.2 volts.
At a idle,there not much power coming out of the alternator and the bike is using most of it just to keep it running and all the lights on.
If I "choke" it just a touch and pick up the idle to around 1500 rpm the volts rise pretty quick.
It takes about 15-20 minutes of driving to get the battery volts back up to "normal" at a idle.

My battery will take around 15 amp right after cranking..then start to taper off to 3-4 amp after 15 minutes or so.

Keep an eye on the battery fluid level.Keep it filled.
Lastly where are you measuring the volts.?
I've seen as much as 0.6 volts lower in the accessory wire compared to the battery post.

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MikeB
Posts: 1223
Joined: Fri Dec 04, 2009 12:54 pm
Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Voltage Adjustment?

Postby MikeB » Mon Jul 14, 2014 10:39 pm

Does the battery need to be fully charged for an accurate reading?

An accurate reading is dependent on what you are using for a voltmeter. If you are getting 11.75 across the battery while the engine is idling and using a VOM, maybe you need to replace the battery.

Also, is there an adjustable voltage regulator?

The voltage regulator is not adjustable. It is internal to the alternator.
MikeB
Tacoma, WA, USA

mraven
Posts: 13
Joined: Wed Mar 21, 2012 8:27 pm
Location: Moorhead, MN
Motorcycle: 2004 GL1800

Re: Voltage Adjustment?

Postby mraven » Wed Jul 16, 2014 12:48 pm

Thanks. I charged the battery and the alternator output came up.




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