OEM stock alternator output


Information and questions on GL1500 Goldwings (1988-2000)
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steve allen
Posts: 163
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 2002 Yamaha VMax 1200
1994 GL1500 SE
1995 CB1000

OEM stock alternator output

Post by steve allen » Fri Aug 16, 2019 8:03 am



I have a 1994 GL1500SE that the original alternator went out a few years ago, bought a rebuilt from ebay, less than a year later, it gave up. I got a replacement under warrantee, now, less than a year later, has gave up again...…..question, is the oem alternator a high output? The ones I replaced was 55-60 amp I believe, just wonder if I was to replace with high output, and would it hurt electrical system? Thanks, Steve



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bluthundr31
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Location: Morgan Hill, CA.
Motorcycle: 1991 GL1500 Interstate (Cinnamon Beige)

Re: OEM stock alternator output

Post by bluthundr31 » Fri Aug 16, 2019 10:45 am

The OEM alternator is not a high-output alternator and can quickly become "under-powered" when numerous electrical add-ons are installed. There are a handful of manufacturers that make 90-95 amp output alternators that will fit the 1500's. Compufire is a common high output replacement for the OEM alternators. The high output alternators will not impair your electrical system.

Do a "search" on this topic and you'll see many discussions about the compufire and others too.

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hugger-4641
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Location: McKenzie, TN
Motorcycle: 1994 GL1500 Aspencade, 1982 CM 200 Twinstar, 1984 VT500 Ascot

Re: OEM stock alternator output

Post by hugger-4641 » Fri Aug 16, 2019 11:12 am

As mentioned already, the OEM alternator is only 40amp. The Compufire is the way to go if you can spare the change. I'm running DB electrical 90 amp on mine and have been happy with it, but I did have a regulator go out on it after two years. I think this was actually due to a short that I had, so I 'm not blaming the alternator. Either way, you need to make sure your battery is a good AGM type battery if you upgrade the alternator.
The enemy of any alternator, particularly the regulator assembly, is heat. The Goldwing does not have a really good path for heat to escape the alternator area, so it is really important to keep the alternator clean and free from dust, oil film, etc. I have even contemplated modifying my side covers to allow some extra airflow, just haven't done it yet.

steve allen
Posts: 163
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 2002 Yamaha VMax 1200
1994 GL1500 SE
1995 CB1000

Re: OEM stock alternator output

Post by steve allen » Mon Sep 09, 2019 4:25 pm

Again, my alternator has bit the dust....3rd one in 2 years! I just had the oem alternator rebuilt, and it didn't last a hundred miles. I have no extra lights on bike, no accessories aftermarket, what could be killing my alternator? 1994 SE with a bit over 125,000 miles.

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CrystalPistol
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Location: Shenandoah Valley of Virginia
Motorcycle: 1997 GL1500SE/'98 Lehman Trike

Re: OEM stock alternator output

Post by CrystalPistol » Mon Sep 09, 2019 5:50 pm

I bought my trike and found it already had a Comp-u-Fire alternator …. and new Odyssey AGM battery in 2004. Comp-u-Fire developed a open winding of the rotor in 2005 later, took it to local alt / gen / motor repair shop. New rotor on shelf, brushes were like new, cost just a little over $100 to get fixed. Found out then that it was a Delphi or DelcoRemy CS121 car alternator with a new redesigned end frame to mount and a new 4 vane driver in place of pulley, has internal regulator/rectifier. A repair kit for Delco CS130 or CS121 will service it.
It never gave me another problem.

I stumbled on another Comp-u-Fire on Ebay years later, new off a wreck. Threw in a $120 bid & won. It's my #1 backup.
I was also given a good working OEM alternator, it's my #2 backup.
That 2004 Odyssey PC680 AGM battery was removed from the trike in 2016 … and is currently serving in what was my 1985 GL1200A I sold in June, and still doing it's thing. I replaced it simply because I thought 12 years was long enough, apparently it wasn't long enough.

OEM (smaller one) vs Comp-u-Fire (bigger one)


I just remembered, I actually have the Ebay one on the trike, the older one is my #1 backup now because … my first Comp-u-Fire developed an oil leak at shaft seal behind the vaned drive, I replaced the bad seal with Chicago Rawhide # 9878 or National # 471224 seal. Made a "vane wrench" of wood to hold vane drive still while I turned shaft with a big Allen wrench. So I know both are A-OK.
Image

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hugger-4641
Posts: 271
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Location: McKenzie, TN
Motorcycle: 1994 GL1500 Aspencade, 1982 CM 200 Twinstar, 1984 VT500 Ascot

Re: OEM stock alternator output

Post by hugger-4641 » Tue Sep 10, 2019 2:19 pm

steve allen wrote:
Mon Sep 09, 2019 4:25 pm
Again, my alternator has bit the dust....3rd one in 2 years! I just had the oem alternator rebuilt, and it didn't last a hundred miles. I have no extra lights on bike, no accessories aftermarket, what could be killing my alternator? 1994 SE with a bit over 125,000 miles.
Please see my prior post about the causes of failure, but rebuilding OEM alternators is a roll of the dice unless the rotor has been replaced or re-wound. The mfg of the OEM Hitachi alternators was moved to China in the mid 1990's and they suffer from a weak point of the wire in the rotor assemblies. I have replaced brushes and regulators on several OEM units only to have the rotor windings fail shortly after. I have actually fixed a few of these rotors also and also have a DIY article here about fixing this problem, however, it is not something I recommend to try unless you have the tools and the skills. If you can even find third party to do this , it is usually cost prohibitive as well. The ones I repaired that were not my own were done as favors to friends, there's just too much labor involved to really be economical.
If you can't spare the dough to get a Compufire or other upgrade, I would just pick up a couple new OEM's on E-bay for about $50 each and keep one ready. Like I said, it's a crap shoot, you may get an OEM that lasts 60k miles or, as you have experienced, it may last 100. My experience with them is anywhere from 10k to 40k miles before they fail.



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