40amp versus 90 amp.


Information and questions on GL1500 Goldwings (1988-2000)
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purchelli
Posts: 40
Joined: Fri Mar 06, 2015 2:57 am
Location: Auckland, New Zealand
Motorcycle: 2000 Goldwing 1500 GL SE

40amp versus 90 amp.

Postby purchelli » Wed Apr 27, 2016 4:34 am



Hi all, I've had a couple of major let downs due to my apparently dying factory alternator. I had the brushes replaced after the first let down. After the brushes were replaced I rode it another 450 miles and it stopped charging again but this time apparently due to the alternator rotor which has a broken coil. SO OUT SHE GOES !! A compufire is the obvious replacement choice however I'm concerned that they put out far more power than my bike needs. It also means my brand new liquid cell battery will need to be replaced with a sealed battery. I run pretty much standard lights front and rear. Our climate means I'll never require any aftermarket electrical heating. I do however use the cassette deck continuously and like the stereo system up loud. Stereo system is factory. I'm interested in any feedback you may have on 40 amp versus 90 amp replacement. Any recommendations and warnings. Thanks all



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NVSB4
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Location: Arlington, Texas
Motorcycle: 1996 GL1500SE
1992 GL1500I (sold)
1986 GL1200A (sold)
2002 HD FXDL Low Rider (sold)
1993 Yamaha Virago XV1000 (sold)
Too many others to list

Re: 40amp versus 90 amp.

Postby NVSB4 » Wed Apr 27, 2016 6:18 am

The 1500 is notorious for not charging the battery if under around 2000 rpm, so your driving environment may be the issue.
Many here have replaced the stock alternator with a higher amperage one.
I replaced mine with a 95 amp from Lactircal (off Amazon, but don't know the availability in NZ) instead of the Compufire, as it is almost 1/3 the price.
Yes, you will need to replace the battery with an AGM, but it's a small price to pay for peace of mind.
It's never too late to have a happy childhood!

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Bluewaterhooker0
Posts: 556
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Location: Tampa, Fl
Motorcycle: 1997 Goldwing GL 1500 SE

Re: 40amp versus 90 amp.

Postby Bluewaterhooker0 » Wed Apr 27, 2016 11:02 pm

I replaced mine for exactly the same problems and reason. I used a Lactrical 85A version. Works great, and charges the battery MUCH better than the stock 40A. I already had an AGM battery, and believe that's the only way to fly, in general. Replace the rubber dampeners when you install the new alternator, and you're good to go. As was stated, the Lactricals go for about $150, far cheaper than the Comp-U-Fire. Reliability seems to be about the same.

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Fiberthree
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Motorcycle: Black 1999 GL1500SE

Re: 40amp versus 90 amp.

Postby Fiberthree » Thu Apr 28, 2016 12:13 am

I replaced my stock unit with the Compufire in November of 2005. With the Compufire and the stock lighting I never had a problem of overcharging the battery. Since "05 I have replaced 99% of the lights with LEDs and still no electrical problems. If the cost is not much higher, I don't think you will harm anything with the 90 amp unit.
Ed

WARNING: All posts are subject to influence from an uncontrollable dominant sarcastic gene. Offensive remarks may or may not be intentional.

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hugger-4641
Posts: 180
Joined: Wed May 25, 2011 1:07 pm
Location: McKenzie, TN
Motorcycle: 1994 GL1500 Aspencade, 1982 CM 200 Twinstar, 1984 VT500 Ascot

Re: 40amp versus 90 amp.

Postby hugger-4641 » Thu Apr 28, 2016 1:06 am

If you aren't running a bunch of extra lights and other gadgets and you aren't idling around a lot, then 40amp is sufficient and they run quieter than the larger amp replacements. The problem is ,you don't want an OEM Hitachi 40amp because of the faulty rotor issues. Unless you get a rebuilt unit from Ken Hemlin or some other specialist shop that has addressed the rotor problem, there's not much way to tell a "good" OEM unit from the ones prone to rotor failure. Some people just go ahead and upgrade to an 80 or 90 amp because that is the easiest way to get away from the stock 40 amp. You should upgrade that battery anyway, but unless you are adding a bunch of extra gizmos, there is no requirement to go with a $400 Compufire when an Lalectrical or Dbelectric will do just as well.
I don't know what the availability is like in New Zealand, but if you don't have any other options, you might be able to locate a junked mid '90s model Saturn car or the alternator from one. Some of them had the same alternator as the Goldwing except that the Saturn unit had a 60amp or larger rating. You just have to swap the housings out since the Saturn runs off a belt drive.

If you happen to be the type that likes to tinker, there is a How-To article here that shows how to repair that bad coil in the rotor. I've done it successfully a few times now for myself and some other folks. If you lived close to me, I'd do it for you, but it's not rocket science.

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lamasue
Posts: 82
Joined: Tue May 13, 2014 7:57 pm
Location: fayette,maine
Motorcycle: 2000 1500se

Re: 40amp versus 90 amp.

Postby lamasue » Thu Apr 28, 2016 12:16 pm

ken hemming says bike runs at 35 amp so go ahead and spend the money I got a 85 amp from ken at good price and it was bench tested

purchelli
Posts: 40
Joined: Fri Mar 06, 2015 2:57 am
Location: Auckland, New Zealand
Motorcycle: 2000 Goldwing 1500 GL SE

Re: 40amp versus 90 amp.

Postby purchelli » Sun May 01, 2016 3:22 am

thanks all for the comments and advice. This is just an awesome forum !!!

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Davek80514
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Location: Dacono, Colorado
Motorcycle: 1992 Goldwing 1500 SE

Re: 40amp versus 90 amp.

Postby Davek80514 » Mon May 02, 2016 10:24 am

NVSB4 wrote:The 1500 is notorious for not charging the battery if under around 2000 rpm, so your driving environment may be the issue.
Many here have replaced the stock alternator with a higher amperage one.
I replaced mine with a 95 amp from Lactircal (off Amazon, but don't know the availability in NZ) instead of the Compufire, as it is almost 1/3 the price.
Yes, you will need to replace the battery with an AGM, but it's a small price to pay for peace of mind.


My brother got both of us the same alternator that you have. But can someone explain why we need to get AGM batteries when we install them :?:
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NVSB4
Posts: 1127
Joined: Sat Mar 03, 2012 6:39 pm
Location: Arlington, Texas
Motorcycle: 1996 GL1500SE
1992 GL1500I (sold)
1986 GL1200A (sold)
2002 HD FXDL Low Rider (sold)
1993 Yamaha Virago XV1000 (sold)
Too many others to list

Re: 40amp versus 90 amp.

Postby NVSB4 » Mon May 02, 2016 2:13 pm

Davek80514 wrote:My brother got both of us the same alternator that you have. But can someone explain why we need to get AGM batteries when we install them :?:


The AGM batteries are sealed. The higher amp alternators can/will boil the others.


It's never too late to have a happy childhood!

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Red=All bikes Blue=Wings

Chris


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