voltage gauge


Information and questions on GL1000 Goldwings (1975-1979)
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TWist0118
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Motorcycle: 1981 Honda Goldwing GL1100
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voltage gauge

Postby TWist0118 » Thu Oct 13, 2011 3:09 pm



hey everyone, can anybody tell me if the volt gauge on my console of a 78 gl1000, reads the volts at the battery, or coming out of generator, or regulator, I'm reading 11 volts@ 3000 rpms, battery dead, but bike will run with a jump,could dead cell in battery affect the readind on my volt gauge, also last week i did notice gauge was pegging at 15 volts. Thanks for ur input, Twist0118



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virgilmobile
Posts: 7663
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 gauge

Postby virgilmobile » Thu Oct 13, 2011 4:02 pm

I might question the accuracy of a 30+ meter.
Your meter measures volts on the switched ignition.It looks at the volts on the line after the ignition switch,otherwise it would be on all the time.
You could test the volts directly across the battery lugs,Yes both lugs,not using the frame for the ground.
Generally speaking,Static voltage with the key off will be about 12.8 volts.
Turn on the key and the bike draws about 10 amp,this will drop the volts a little,maybe as low as 11.8.
Start the bike and bring it to 2500 rpm,the volts should climb slowly(2-3 minutes)to 13.5-14.8 volts.
The charge rate is also proportional.It will charge near 15 amp for a few minutes then taper off to near 3 amp.

All these voltages can change a little with temperature,battery type,age,condition,and obviously your charging system quality.

Oh and yes,a dead cell would effectively operate the system as if the battery were not even there.The regulator would try to max out to charge the battery,increasing the voltage along with it.
Check the fluid in the battery or have it tested at Autozone or Walmart.

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virgilmobile
Posts: 7663
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 gauge

Postby virgilmobile » Thu Oct 13, 2011 4:06 pm

Just another note...You may now have problems with the stator/regulator/diodes/connections.
I mention this because you say "I get 11 volts at 3000 rpm"
Be prepared for anything.

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FADM Stern GNSF
Posts: 20
Joined: Thu Jul 07, 2011 6:09 pm
Location: Toronto, Ontario, Canada
Motorcycle: 1971 GL1000
1982 Cx500C

Re: voltage gauge

Postby FADM Stern GNSF » Fri Oct 14, 2011 9:14 am

Check out the battery first, as if its crappy (bad cell, too old, not been maintained "PROPERLY") it will load down the whole charging system (and this WILL kill the stator if leaft unchecked). If you are sure that the battery is OK (and be SURE you know what a good battery REALLY IS, see http://cxgl.wikispaces.com/Charging+System and http://cxgl.wikispaces.com/Batteries) then you can start checking the rest of the systems;

- Meassure voltage across the voltage gauge to verify the guage is accurate and OK
- Check the charging system WITH a "PERFECT" battery attached.
1979 GL1000
1982CX500C

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grandpa
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Joined: Sat Aug 07, 2010 3:23 pm
Location: Denmark
Motorcycle: 1978 GL1000 Interstate

Re: voltage gauge

Postby grandpa » Fri Oct 14, 2011 11:15 am

Hi. I had a similar problem om mine 78. When I checked voltage on the battery itself I had full volt, but my meter read only about 10,5 volt. At app. 3500rpm I had about 12volt on the meter. I then figured out that because of the 10Amp draw and poor connection in combination there was a masiv drop in voltage to where the meter took it reading. I then changede the wiring so the meter measured direct at the battery. Then I have no problem. But remember the gauge is slow reacting on changes of volt.
Have a nice and safe weekend

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Fred Camper
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Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: voltage gauge

Postby Fred Camper » Fri Oct 14, 2011 8:13 pm

My bike has a bad battery currently. Checked the stator and it passes with 58 volts on each pair of legs at 3000 rpm. When the battery was good, I got 13.88 volts when idling. But now with a bad battery (reads 12.2 volts fully charged once it flattens out) I get 11.8 volts when idling. Voltage is above 13 when running, but the bike basically discharges in an idle now.

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FADM Stern GNSF
Posts: 20
Joined: Thu Jul 07, 2011 6:09 pm
Location: Toronto, Ontario, Canada
Motorcycle: 1971 GL1000
1982 Cx500C

Re: voltage gauge

Postby FADM Stern GNSF » Sat Oct 15, 2011 11:21 am

To do a battery check and verify the battery is actually OK, follow the testing section http://cxgl.wikispaces.com/Batteries

If your battery voltage when you take it off the charger is less than 12.5V then the battery is no good. If it reads OK, leave the battery for 2 hours, and if it has dropped below 12.4V its bad. If your battery is "dragging" the charge voltage down to 11.8V then you are probabaly really stressing the stator (heavey current draw) and you should consider a new battery as its far cheaper than replacing a stator.

Note - ALWAYS change a new battery up BEFORE you use it, they only ever come at 80% max charge, and if you use it like this THAT 80 will be you max capaicty from that point on.
1979 GL1000
1982CX500C

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TWist0118
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Joined: Sun Aug 28, 2011 2:50 pm
Location: jacksonville Beach, Fla.
Motorcycle: 1981 Honda Goldwing GL1100
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Re: voltage gauge

Postby TWist0118 » Sun Oct 16, 2011 2:19 pm

o.k update!!! New battery, 12.7 volts read after trickle charge 12 hrs, installed, fired it up, idled for a few mins, console volt gauge got up to almost 12 volts, better than the 11 it was reading before battery change, multi meter says 12. 5@ 3000 rpms, took bike for 2 seperate 1/2 hr rides highway and stop and go traffic, after each ride read battery voltage with multi-meter 12.5 / 12.6, . Is Charging system working adequetly enough? i know it should be pushing atleast 13.5 volts, but it's not, also did notice chaffing of plastic casing around power supply cable from starter relay to starter, only plastic chaffed, wire cable still looks good, but is exposed about 1/2in wide- 2 in long, does any charge current run through this cable? thanks for the input!!! Twist0118

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Fred Camper
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Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: voltage gauge

Postby Fred Camper » Sun Oct 16, 2011 4:10 pm

Okay, now you need to test the Stator output. First there may be a 3 pin connector between the stator and the main 8 pin connector going to the rectifier. This stuff is in front of the battery and under the left side cover. The 3 pin connector is common to fail, and most users eliminate it as it is not needed. So follow the three yellow wires from the stator and see if they go to a 3 pin connector before joining additional wires at the 8 pin. If you see any melting at the 3 pin, cut out the connector and solder the wires back together.

Here is a tutorial link for the above;
http://www.ngwclub.com/forum/viewtopic.php?t=32968

To test the stator, here is a tutorial link;
http://www.ngwclub.com/forum/viewtopic.php?f=8&t=27215

If you do not have a 3 pin connector, you check the stator wires at the 8 pin connector, nothing different about that.




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