GL1500 Charging Issues


Information and questions on GL1500 Goldwings (1988-2000)
  • Sponsored Links
Post Reply
BuckTL
Posts: 3
Joined: Fri Jul 12, 2019 1:09 pm
Location: Oostburg, WI USA
Motorcycle: 1993 GL1500 Aspencade

GL1500 Charging Issues

Post by BuckTL » Fri Jul 12, 2019 2:09 pm



I had my bike in storage for a week because I was putting in a mica floor in my garage. When I picked it up I had a reading of 10.4 volts but the bike started. On the ride home it charged at 13.8 v and then poof I was at 10 volts and dropping. I started with new battery because my voltage shouldn't have dropped that much over a week. Installed the battery and now I hold 12 volts. After reading posts on your website I thought my alternator wasn't charging or the regulator was shot. I bought a new 90 amp from Amazon and have the same problem. Before starting battery voltage was 13.08v. After starting 12.3 at idle, 1500, and 3000 rpm. Took the bike for a ride and values dropped about .5 volts across the board. Does anyone have an idea what to try next?



User avatar
MikeB
Posts: 2543
Joined: Fri Dec 04, 2009 12:54 pm
Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: GL1500 Charging Issues

Post by MikeB » Fri Jul 12, 2019 2:38 pm

Either the alternator you received from Amazon is defective, or neither alternator is defective.
There are only two wires on the alternator. One of them may not be connected properly or it has an open circuit in the wire somewhere. That is where I would start troubleshooting.
MikeB
Tacoma, WA, USA

BuckTL
Posts: 3
Joined: Fri Jul 12, 2019 1:09 pm
Location: Oostburg, WI USA
Motorcycle: 1993 GL1500 Aspencade

Re: GL1500 Charging Issues

Post by BuckTL » Sat Jul 20, 2019 3:19 pm

I replaced the 55 amp fuse even though the other one looked good and miraculously the new alternator started charging at 14 volts. A week later I am back to the same issue with the battery discharging while it was running. I bought an ammeter and found that it is charging at 20 amps which is not enough. Is there anything else that could be wrong except the internal regulator?

User avatar
ct1500
Posts: 1140
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
Contact:

Re: GL1500 Charging Issues

Post by ct1500 » Sat Jul 20, 2019 3:52 pm

Sounds like you are relying on an on board volt meter which could be flaky. Always use a test equipment meter with leads attached at the battery posts to diagnose charging system, then at the alternator output post with (+), then with the negative terminal on a good engine ground point.
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do

User avatar
AZgl1800
Posts: 1799
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800

Re: GL1500 Charging Issues

Post by AZgl1800 » Sat Jul 20, 2019 4:53 pm

I wired my panel Voltmeter DIRECT TO BATTERY.

it shows me exactly what is going on..... when this picture was taken, the key switch was OFF..... yes, it is on all the time.... but I always use a Battery Tender.


you can do the same, though I would suggest that you use a relay to turn it off when the ignition is turned off.....

do that by connecting the coil to the Accessory terminal on the fuse box.


~John
What is the Forum Index?
http://bit.ly/2GnjbzV

Download it here:
http://bit.ly/2SLDNqF

BuckTL
Posts: 3
Joined: Fri Jul 12, 2019 1:09 pm
Location: Oostburg, WI USA
Motorcycle: 1993 GL1500 Aspencade

Re: GL1500 Charging Issues

Post by BuckTL » Sun Jul 21, 2019 1:00 pm

Thanks for the suggestion. I put the ammeter which shows volts and amps at the battery with a shunt which gave me 20 amps with battery voltage that was dropping about a tenth of a volt per second.

User avatar
WingAdmin
Site Admin
Posts: 20435
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer

Re: GL1500 Charging Issues

Post by WingAdmin » Tue Jul 23, 2019 2:00 pm

BuckTL wrote:
Sun Jul 21, 2019 1:00 pm
Thanks for the suggestion. I put the ammeter which shows volts and amps at the battery with a shunt which gave me 20 amps with battery voltage that was dropping about a tenth of a volt per second.
If the battery voltage was dropping, then you were not charging at 20 amps. You were DRAINING the battery at 20 amps. That means the alternator was not charging at ALL, and the bike was actually running off the battery at the time you were measuring it.

Sounds like the regulator/rectifier on the alternator might be bad.



Post Reply