Alternator Tester - Steve Saunders Goldwing Forums

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post #1 of 6 (permalink) Old 09-27-2018, 09:36 PM Thread Starter
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Join Date: Nov 2011
Location: Summerdale, Alabama, USA
Model: 2000 GL1500SE
Posts: 187
Red face Alternator Tester

I have a couple of extra alternators for my 2000 GL1500 and am planning on building a setup where I can, after hooking up to a 12 volt battery, get them turning at various RPMs. My question is, while viewing the alternator from the front (motor side), does it turn clockwise or counterclockwise? Also, since it has no pulley, has anyone come up with a temporary but sturdy hookup to attach the alternator to the power source, i.e. electric drill, 110 volt motor, etc.? My main objective is to check the voltage output at various RPMs before I install them, as well as to see if they need an overhaul before use. Any advise is definitely appreciated, 'cause at age 72, I really don't know everything there is to know, like I thought I did at age 16!!!

Current rides--
2000 Gl1500SE
1999 Suzuki Intruder 800
1998 Yamaha Virago 1100

Past rides---
1975 GL1000
1978 GL1000
1987 Gl1200




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post #2 of 6 (permalink) Old 09-27-2018, 11:02 PM
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Join Date: Oct 2006
Location: Green Bay, Wisconsin, USA
Year: 1999
Make: GL1500 SE
Posts: 5,438
My local alternator shop just used a belt to test mine. It stayed on well enough to do the test but it made a pretty funny noise when they spun it with the belt. Alternators can be tested in either direction. Makes no difference. Bad thing is a drill will not turn anywhere near fast enough to give you any meaningful data. You have to spin the alternator over 2,000 RPM for it to be efficient at all. Just take them to an alternator shop for testing. Tell them to flop aa belt on the coupler and enjoy the sounds.
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Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #3 of 6 (permalink) Old 09-28-2018, 11:13 AM
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Location: Silver Spring, Maryland, USA
Model: '99 Gold Wing SE
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The OEM GL1500 alternator generates 550 Watts of output at 5,000 alternator RPM's.

Watts divided by volts = Amps.

At 2,778 Bike RPM's the alternator is turning 5,000 RPM's.

I have a document that lists amperage output at various engine RPM's.

I did calculate the ratio of engine to alternator RPM's...........!

This guy knows how to do it.........!!!

http://myplace.frontier.com/~hemi-roid/
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post #4 of 6 (permalink) Old 09-28-2018, 05:44 PM
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Location: Tacoma, Washington, USA
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Quote:
Originally Posted by DBohrer View Post
The OEM GL1500 alternator generates 550 Watts of output at 5,000 alternator RPM's.

Watts divided by volts = Amps.

At 2,778 Bike RPM's the alternator is turning 5,000 RPM's.

I have a document that lists amperage output at various engine RPM's.

I did calculate the ratio of engine to alternator RPM's...........!

This guy knows how to do it.........!!!

http://myplace.frontier.com/~hemi-roid/
Yes he does and is darn good at it.


But for me, I just mount the alternator in the bike and test it. A bit more work but it is in the environment it was designed for. Since I do not have the necessary tools to load the alternator, I can't think of a better way for a test of its current generating ability than to put it under actual load.
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1998 - GL1500 w/175,000 miles
2003 - GL1800 w/106,000 miles
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post #5 of 6 (permalink) Old 09-28-2018, 10:36 PM Thread Starter
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Join Date: Nov 2011
Location: Summerdale, Alabama, USA
Model: 2000 GL1500SE
Posts: 187
Thanks fellows, for the advise and info, I'll check it out!

Current rides--
2000 Gl1500SE
1999 Suzuki Intruder 800
1998 Yamaha Virago 1100

Past rides---
1975 GL1000
1978 GL1000
1987 Gl1200




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post #6 of 6 (permalink) Old 09-28-2018, 10:59 PM
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Location: Silver Spring, Maryland, USA
Model: '99 Gold Wing SE
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You are welcome...!
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