Hot Alternator

Information and questions on GL1500 Goldwings (1988-2000)
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Posts: 2
Joined: Mon Jan 11, 2010 7:20 am
Location: Brisbane, Australia
Motorcycle: 88 GL1500

Hot Alternator

Post by Grant » Fri Jan 22, 2010 10:00 pm

Hi, I've just got myself an old 88' 1500 that needs a lot of fixing-up before I can ride it, but I have a question about the standard alternator. It is putting out around 14.4 volts with a good charged battery, but the alternator seems to get Very HOT after about 2 minutes of running, it is much hotter than the engine. I was wondering if this is normal, or if extended running is going to cook my recently rebuilt but secondhand alternator. The bloke I bought it from upgraded to a compufire because he had a lot of lights & stuff (lit up like a christmas tree). I think I wouldn't even notice if the sidecover was on because it's not as if you can smell it cooking but I never knew my CBX alternator to get so hot so quickly. Any help thanks.

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Re: Hot Alternator

Post by WingAdmin » Thu Mar 11, 2010 7:37 am

If an alternator is hot, it's putting out a lot of power - i.e. it's under load. One of the main loads that can draw a lot of amps is the battery (recharging). Starting the bike does draw a lot of power, and it can take a few minutes for the battery to recover, during which time the alternator will be hot - because it's working hard.

I'd go ride the bike for 15-20 minutes, then check it to see if it is still that hot. A cheap infrared thermometer will help you get the exact temperature.

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