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3rd Brush Generator Output

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RickinKansas

03-01-2001 11:05:35




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I'm getting my 9N ready for the spring garden. After a hard winter I found my third brush generator not working. This is a 6 volt system. Took it in, had it rebuilt, after installing it I found my cut-out relay not closing. Not a problem, I'll get a new one. While checking all this I found the output of my generator at half throttle is 6.86 vdc. At full throttle it is close to 24 vdc. I know I can adjust the third brush to regulate the output, but is this high of a voltage normal? I'm going to replace my cut-out relay, I just don't want damage anything with a 24 volt generator until I get it all set. Should I set my generator output at about 7.0 volts then go from there?

Best Regards!!!!

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Lee St. Clair

03-01-2001 18:43:29




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 Re: 3rd Brush Generator Output in reply to RickinKansas, 03-01-2001 11:05:35  
I would sure get that cutout on there soon! What you're seeing is an unloaded voltage that has no where to go. This is normal. Problem is this...most automotive components are made to withstand about 2.1 times rated voltage. 24 volts exceed that by a good margin. That doesn't mean that the unit will fail necessarily with 24 volts but with that older insulation, there is a good chance. Many a generator has gone west because of the escalated breakdown voltage.

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Claus

03-01-2001 12:38:04




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 Re: 3rd Brush Generator Output in reply to RickinKansas, 03-01-2001 11:05:35  
Sounds like you do not have it hooked up to the battery. The battery would prevent the voltage to go up to 24 volts. Better check your connections. Happy Motoring
Claus



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RickinKansas

03-01-2001 16:21:21




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 Re: Re: 3rd Brush Generator Output in reply to Claus, 03-01-2001 12:38:04  
The cut-out relay is not closed, Have not replaced it yet. This would isolate the generator from the battery, I believe? It sounds like I should change my cut-out relay, then check the voltage from my generator. Am I getting close?



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Claus

03-01-2001 17:39:37




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 Re: Re: Re: 3rd Brush Generator Output in reply to RickinKansas, 03-01-2001 16:21:21  
Do not run the generator with a defective cutout or none in the circuit. This could overheat your field winding and turn it into a crispy critter. All of this voltage that you see is being applied to your field winding when you do not have a battery for a load. Happy Motoring
Claus



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