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11-30-2019, 11:45 AM | #1 |
Member
Join Date: Jan 2016
Location: Monterey Bay, Ca
Posts: 35
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Generator Brush Adjustment
Good morning,
From the description in the Les Andrews book, I believe I have a 30/31 generator (photo of end plate w/brushes attached). Was driving one day and noticed my ammeter was registering 0 amps. I've done most of the work on my '29 CCPU, but I was intimidated by the thought of taking the generator apart to see if there was an obvious reason for the 0 amp reading. I followed the instructions in the book and my fears were gone (not as complicated as I thought). The problem was one of the brush screws came out and the wire was disconnected. I easily re-connected the brush & wire and started it right up, but now the ammeter is reading 20 amps wth RPMS increased (all lights off). Question: Which is the 3rd brush? Is it adjustable? If so, how? Any help is greatly appreciated. Thanks |
11-30-2019, 11:56 AM | #2 |
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Join Date: May 2010
Location: Portland OR
Posts: 6,340
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Re: Generator Brush Adjustment
It's the one on the slip ring, you should be able to move it without loosing anything;
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11-30-2019, 03:54 PM | #3 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Generator Brush Adjustment
push downward on the adjustable brush that is pictured , to increase the charge rate . The slip ring should slightly rotate when pushed down or raised up .
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11-30-2019, 04:42 PM | #4 |
Member
Join Date: Jan 2016
Location: Monterey Bay, Ca
Posts: 35
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Re: Generator Brush Adjustment
Thanks for the help redmodelt & Purdy Swoft.
I was cleaning it up and was able to determine the 3rd brush arm is connected to the slip ring. The other thing I noticed was the 3rd brush arm is copper colored while the others are silver. I'm waiting for new brushes, then re-installing. I'm also guessing the closer the 3rd brush is to the other = higher amp output. (?) |
11-30-2019, 05:09 PM | #5 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Generator Brush Adjustment
Yes , The slip ring will rotate only so far . If a voltage regulator is used it will allow the generator to cycle between higher and lower charge rate to prevent overcharging the battery . When a voltage regulator isn't used , the adjustable brush needs to be set for a lower charge rate because the generator will charge the same rate most of the time without cycling .
I use the Fun Projects voltage regulator that takes the place of the cutout . I set the third brush for a ten amp maximum charge . In normal operation the generator would only charge a short time on ten amps . Ten amps would quickly charge the battery . Higher amps will only be needed when the lights are used . The ammeter will mostly show a discharge when the lights are on . It takes a good while to kill the battery so not to worry too much . |
12-02-2019, 01:29 PM | #6 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Generator Brush Adjustment
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