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Voltage issues

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SS from MI

09-21-2004 11:08:48

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I have 52 8n, 6v pos grnd. Generator was rebuilt. From generator Iam getting 7.2 volts when measuring from armature to ground with volt meter. With engine off I get 6.2 volts from battery. With engine running and measuring voltage on battery, my voltmeter goes crazy and cant get correct volt readings. I tried measuring voltage on VRegulator. From arm to gnd and get 7.2 volts. Is my VR working correctly. Why do I get unreadable voltage from battery when engine running. Thanks

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Jim Cox

09-21-2004 12:13:04

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Re: Voltage issues in reply to SS from MI, 09-21-2004 11:08:48

Dell is right. You need a VREG. Once again, analog triumphs over digital. You can't beat a simpson 260 analog VOM in the field ( as long as you have a big enough toolbox )and for voltage and current measurements, no batteries needed. I wish I still had my Radio Shack analog meter from high school.

Jim Cox
Analog Afficianado

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Dell (WA)

09-21-2004 12:08:19

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Re: Voltage issues in reply to SS from MI, 09-21-2004 11:08:48

SS..... ....congratulations, you have accurately diagnosed a BAD voltage regulator. Replace it and don't forget to polarize your new voltage regulator.

The reason your digital voltmeter seems to be acting crazy is the voltmeter ARM to BATT cut-out relay is chattering from bad relay pivot points. Your DVM has a "peak" voltage detector. Chattering points give various voltage reading and your meter is trying to keep up reading each chatter.

Your genny is good because you read about 7.2 volt at the genny ARM to ground. Your battery is good because you read about 6.2 volt with the engine/genny NOT RUNNING. Iff'n yer Voltage/Regulator was "good", you'd read about 7.2 volts at the battery when the engine was running and charging your battery (which you don't)..... ....Dell

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SS from MI

09-21-2004 12:33:41

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Re: Voltage issues in reply to Dell (WA), 09-21-2004 12:08:19

I am a little confused. Are the crazy readings I am getting from My meter from the bad Voltage regulator chatter or because of interference from sparkies and stuff. FYI. My ammeter shows little or no amps.

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Dell (WA)

09-21-2004 12:42:40

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Re: Voltage issues in reply to SS from MI, 09-21-2004 12:33:41

SS..... ..iff'n it was a digital meter problem, you'd find that your genny ARM reading while running would cause irratic digital voltmeter readings. Itzchur voltage regulator. CHANGE IT..... ..Dell

And yes, some digital volt meters DVM or DMM are more sensitive to sparkies than others and that the meter leads can act as antennas. Remember the first radio transmitter by Marconi was a "spark-gap" transmitter..... .....Dell

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SS from MI

09-21-2004 12:56:18

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Re: Voltage issues in reply to Dell (WA), 09-21-2004 12:42:40

That makes sense. I will take your advice and buy new one. Thanks

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SS from MI

09-21-2004 11:59:27

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Re: Voltage issues in reply to SS from MI, 09-21-2004 11:08:48

Thanks for the help. But after searching archives I found that it must be the Digital Meter I am using.

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Bob

09-21-2004 13:32:20

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Re: Voltage issues in reply to SS from MI, 09-21-2004 11:59:27

Is your battery going dead, or are there other problems, or are you just worried because of the goofy digital meter?

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BillM (OH)

09-21-2004 11:43:17

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Re: Voltage issues in reply to SS from MI, 09-21-2004 11:08:48

Running engine drives modern digital volt meters crazy -- one of the 'lectrical sperts will tell you why.... voltages you did get look OK to me.

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txblu

09-21-2004 12:02:05

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Re: Voltage issues in reply to BillM (OH), 09-21-2004 11:43:17

A .o1uf ceramic capacitor 50 volt or so(radio shack)across the leads at the meter should eliminate the interference. The leads act as an antenna and the digital dudes have 10x the input resistance of the old analog plus are more sensitive, which together makes them go nuts from sparking generator brushes. Your numbers look good however.

mark

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