Battery Losing Charge


Information and questions on GL1200 Goldwings (1984-1987)
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rjeanes
Posts: 2
Joined: Fri Mar 20, 2015 10:00 pm
Location: Easley, SC
Motorcycle: 1986 GL1200 Aspencade

Battery Losing Charge

Postby rjeanes » Mon Jun 29, 2015 9:21 am



It seems that my battery is losing charge as I am riding. I may just have a bad battery. However, I replenished the fluids in each cell by adding distilled water and placed the battery on charge for 8 hours. Installed it back on the bike and started right up with no hesitation. Drove it around to several places and restarted the bike each time. By the the 4th restart the charge was gone and had to get a jump start. I recharged the battery and then using the Clymers Manual to troubleshoot. With a fully charged battery and the engine off I get 12.8 V. With the engine on at 950 rpm, I get 13.5 V, at 2500 rpm I get 14.8 V and 4000 rpm I get 14.8 V. So it seems the charging system is Okay.

I disconnected the neg. post and hooked up a multi-meter set on DC Volts between the neg. lead and the neg. battery post. With the switch in the off position I am getting a 11.3 V reading which the book says should be 0 V so that indicates something is drawing a current. My questions are: Could this be causing my battery to discharge? If yes, where do I start to find the source and how do I fix it?

Thank you for your help



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WingAdmin
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1982 GL1100A Aspencade (sold)
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Re: Battery Losing Charge

Postby WingAdmin » Mon Jun 29, 2015 9:30 am

The clock in the radio draws a miniscule amount of power at all times, to keep it running. That might be what you're seeing on your meter.

Start pulling fuses one by one, and see if one of them, when pulled, causes that voltage to drop to zero.

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CMReynolds1
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Re: Battery Losing Charge

Postby CMReynolds1 » Mon Jun 29, 2015 9:35 am

Leave your meter connected to the battery and then begin puling fuses, one by one, until the discharge goes away. That would be the circuit that is causing the issue. This will allow you to troubleshoot the right circuit. From there just look for issues. Good luck.
Ride Safe,
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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
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Re: Battery Losing Charge

Postby virgilmobile » Mon Jun 29, 2015 10:41 am

Take the battery for a load test.
Even tho the battery volts are up,It may not have a good capacity.
The bike sounds like its charging OK.
Actually just a bit too much.This may account for the loss of acid level.It may have boiled the battery and reduced its capacity.
There is a relay add on modification to help get the peak volts down a bit.
I think mine maxed out at 14.2 at 3.5k rpm.When it starts to climb over 14.5,overcharging will occure and eventually ruin the battery.
This did happen on my 1100.The battery lasted just one season.boiled dry.Volts OK,No cranking power.

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julimike54
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Location: Euless, Texas
Motorcycle: 1986 GL1200A original owner
2016 HD FLTRU

Re: Battery Losing Charge

Postby julimike54 » Mon Jun 29, 2015 7:10 pm

"There is a relay add on modification to help get the peak volts down a bit."

Can you advise where this modification information is?
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virgilmobile
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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: Battery Losing Charge

Postby virgilmobile » Mon Jun 29, 2015 8:49 pm

Sure..Here's a post about how I perminently solved the charging system weak areas and stabilized it on both my 1100 and 1200..viewtopic.php?t=12522
You may not have to do all the soldering that I had to because of corrosion...the part and wiring are in this post...It's purpose is to provide the regulator module a accurate battery voltage rather than using the bikes switched ignition wire..I have seen this wire on the regulator vary as much as 1.6 volts below the actual battery volts.Rather than rewire the entire bike,"we" just augment the poor circuit.

rjeanes
Posts: 2
Joined: Fri Mar 20, 2015 10:00 pm
Location: Easley, SC
Motorcycle: 1986 GL1200 Aspencade

Re: Battery Losing Charge

Postby rjeanes » Tue Jun 30, 2015 8:29 am

Okay, I also took the battery for a load test and it checked out fine. I cut out the plastic plug and checked continuity between each wire. There was continuity between each (I mistakenly said no continuity earlier). I soldered the wires and covered with shrink wrap. I rechecked the voltage at the battery and getting good voltage at idle and 2500 rpm. It started well this morning and I drove to work (about 40 minutes). I will drive more this afternoon and see if the new soldering did the trick. Thanks for your help.




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