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08-27-2022, 10:45 AM | #1 |
Senior Member
Join Date: Dec 2014
Location: Hillsboro IL
Posts: 480
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checking generator on a 48
I am trying to check if the generator is working on a 48 pickup. With the key off the battery reads 6.25 volts. When the engine is started the digital voltmeter goes all over, just random numbers from 19.0 to 3.5volts and everywhere in between. With the engine running the meter reads like that if only one lead is connected to either battery post or to the engine block,generator arm terminal or touching anywhere on the engine. The generator guage does not show charging. What is going on? Art
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08-27-2022, 11:02 AM | #2 |
Senior Member
Join Date: Jan 2019
Location: Chicago
Posts: 759
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Re: checking generator on a 48
Generators cause static that confuses digital instruments. Better to get an analog meter. However, I am able to use my digital meter to do basic things like measure voltage. You do need to have both instrument leads connected to get any kind of reading. If only one lead connected, all you see is the static.
You are able to measure voltage at the battery with engine not running. Do the same thing with engine running at medium RPM. If generator is charging your digital meter should show 7.0 to 7.5 volts. |
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08-27-2022, 11:16 AM | #3 |
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Join Date: Dec 2014
Location: Santa Maria, CA
Posts: 986
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Re: checking generator on a 48
Best to use an analog meter.
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08-27-2022, 05:38 PM | #4 |
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Join Date: May 2010
Location: Alabama
Posts: 3,277
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Re: checking generator on a 48
This might help
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08-27-2022, 07:50 PM | #5 |
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Location: Arkansas
Posts: 613
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Re: checking generator on a 48
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