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Discussion Starter #1
I know the GL 1500 alternators are rather anemic in output. Thinking of upgrading to a larger output. I also have a GL1800 that seems to have quite sufficient output.
What is the difference in outputs between the 2. I know the 1800 is quite a bit more but can't recall how much more.
 

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I know the GL 1500 alternators are rather anemic in output. Thinking of upgrading to a larger output. I also have a GL1800 that seems to have quite sufficient output.
What is the difference in outputs between the 2. I know the 1800 is quite a bit more but can't recall how much more.
GL1500 alternator output: 550 watts.

GL1800 alternator output: 1100 watts.
 

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Discussion Starter #5
Thanks much. Now a another silly question. Any positive reports on the db alternators?? Or negative.
 

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Lots of reports, I would say around 50% either way.
It is a pig in the poke, just because it is "Rewound and repaired" does not make it bullet proof.

even brand new alternators have failure rates, and they have never been used.
depends on how careful the builder is with the wire junctions.
some of them just use little crimp connections, and don't squeeze it hard enough.
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3 years ago, I decided to buy a new OEM alternator "just because'.
the one in my bike had 97,500 miles on it, no problems, but I was going on a 6 week tour, and just "felt more comfortable" with a new OEM alternator. the cost was maybe $10 bux more than the other guys.... the old alternator was put in the box the new one came in, and then placed in the trailer that I pulled on that trip. It is still in the box, in the trailer. :)

.
 

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It aint rocket science
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Not here to argue but................
1200 watts = 100 amps....
1100 watts = 91 amps.....
Not here to argue either but.......
An alternators job is to keep the battery charged. When calculating amperage output OEM's use the voltage regulator set point (14V +/-) then round results off to the nearest 5A. When voltage drops below a manufacturers minimum charging voltage spec during output testing, the alternators maximum amperage generation can be considered tapped out. Using a calculation of 12V to arrive at output is useless and is not within OEM minimum voltage charging system output. 14V provides an accurate amperage output and keeps the charging/electrical system healthy.
1200 watts = 85.7A
1100 watts = 78.5A
550 watts = 39.2A (GL1500)
 

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Another consideration manufacturers use for sizing an alternator is output at idle RPM. An alternator can only output a small fraction of its "rated" output at idle speed, They size the alternator so that at idle RPMs the alternator will still output enough current to run the bike's electrical system (not including added accessories). But the alternator field is running "saturated" at that point.

Of course, on the 4 cyl Wings the alternator field is ALWAYS saturated. Thus shunt regulators. :ROFLMAO:
 

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Another consideration manufacturers use for sizing an alternator is output at idle RPM. An alternator can only output a small fraction of its "rated" output at idle speed, They size the alternator so that at idle RPMs the alternator will still output enough current to run the bike's electrical system (not including added accessories). But the alternator field is running "saturated" at that point.

Of course, on the 4 cyl Wings the alternator field is ALWAYS saturated. Thus shunt regulators. :ROFLMAO:
That is not the case for a GL1500 OEM alternator.....!
 

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So since no one gave a recommendation I'll ask. What Alternator should I get to boost my '98's output? I'm running a two seat sidecar and would like to have enough juice for the heated blanket that I know is gonna be on Momma's Christmas list.

 

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So since no one gave a recommendation I'll ask. What Alternator should I get to boost my '98's output? I'm running a two seat sidecar and would like to have enough juice for the heated blanket that I know is gonna be on Momma's Christmas list.
Get the CompuFire and call it a day. They are the only manufacturer that can guarantee 60A available output at idle speed and if it ever needs repair, parts are widely available.:)
 
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