New alternator spin freely question?


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samwing1500
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2000 GL1500 Aspencade w/Hannigan Trike

New alternator spin freely question?

Post by samwing1500 »



Shouldn't a new GL`1500 alternator spin free by hand, right out of the box, without any drag, or at
least with only slight drag (brushes) not really very noticeable.


Sam
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MikeB
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Re: New alternator spin freely question?

Post by MikeB »

samwing1500 wrote: Sun Jan 17, 2021 3:00 pm Shouldn't a new GL`1500 alternator spin free by hand, right out of the box, without any drag, or at
least with only slight drag (brushes) not really very noticeable.
Yes, of course. If it is an aftermarket alternator, as in off of Ebay, I would be highly suspect of it.
MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
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samwing1500
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Re: New alternator spin freely question?

Post by samwing1500 »

Thanks for the reply.
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CrystalPistol
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Re: New alternator spin freely question?

Post by CrystalPistol »

They have more drag than just brushes. There is a seal and the bearings too. When you grab and twist it you are also exerting torque to spin a bit of weight of the rotor built up of laminations and windings which make it an electromagnet. If you're just slowly turning it not so much. but if you're hold it in one hand and giving it a twist to see it spin, you gonna feel the weight being spun up.
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samwing1500
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Re: New alternator spin freely question?

Post by samwing1500 »

Ok. Thanks. I was holding it in one hand and turning the 4 blade impeller with my
other hand and there is considerable drag. Very very noticeable even if just rotating
it slowly. Of course it won't spin at all. I am returning it for a replacement. There is
too much drag to make me comfortable installing it.
Sam
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2000 GL 1500 Trike
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newday777
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Re: New alternator spin freely question?

Post by newday777 »

samwing1500 wrote: Sun Jan 17, 2021 10:39 pm Ok. Thanks. I was holding it in one hand and turning the 4 blade impeller with my
other hand and there is considerable drag. Very very noticeable even if just rotating
it slowly. Of course it won't spin at all. I am returning it for a replacement. There is
too much drag to make me comfortable installing it.
What did you get for an alternator?
samwing1500
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Motorcycle: 2000 GL1500 SE
2000 GL1500 Aspencade w/Hannigan Trike

Re: New alternator spin freely question?

Post by samwing1500 »

newday777

I went with a new Compu Fire. Very tight to get it
in the frame but it's in there.
Sam
2000 GL1500 SE
2000 GL 1500 Trike
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newday777
Posts: 2146
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH summer/fall & Oceanside, CA winters(N San Diego) with lots of miles riden between
Motorcycle: 2008 Cabernet Red. Level 4

1983 GL1100A Wineberry 36,000 miles

1975 CB750 K5 Planet Blue 7,800 miles

1976 CB750 K6 Anterris Red 25,000 miles

Past rides
1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: New alternator spin freely question?

Post by newday777 »

samwing1500 wrote: Tue Feb 02, 2021 9:37 pm newday777

I went with a new Compu Fire. Very tight to get it
in the frame but it's in there.
Yes I put a few in, my own and others, and yes they are a tight fit.
samwing1500
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Re: New alternator spin freely question?

Post by samwing1500 »

Just for comparison, here is a pic of stock (top) alternator and the new (lower) Compu Fire installed.
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Sam
2000 GL1500 SE
2000 GL 1500 Trike
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