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Volt meter question.


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#1 Paulgo OFFLINE  

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Posted March 29, 2016 - 01:06 PM

Hi All! I have one of those hand held digital volt meters. I mainly use it to keep track of my batteries and tractor charging status. Normal routine is to set it on a battery, while engine running, and then hook up the probes to see how well the engine is charging. I have something odd going on with one GT. When I get my meter close to the battery it starts going crazy. Readings all over the map, and the probes aren't even connected! Obviously some sort of magnetic field coming off the engine. Any ideas ?  Paul


Edited by Paulgo, March 29, 2016 - 01:07 PM.

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#2 Auburn David OFFLINE  

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Posted March 29, 2016 - 01:09 PM

Called Phantom readings and could be anything.


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#3 ducky OFFLINE  

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Posted March 29, 2016 - 01:12 PM

I have seen florescent lites do that.


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#4 Eric OFFLINE  

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Posted March 29, 2016 - 01:21 PM

This is why I use a trusty fifties Era analog meter, just my preference though.
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#5 Paulgo OFFLINE  

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Posted March 29, 2016 - 01:31 PM

First time I've ever had it happen. Weird.


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#6 larrybl OFFLINE  

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Posted March 29, 2016 - 01:44 PM

Low battery in the meter? I can see electro-magnet affecting an analog meter as the meter movement is a magnet and coil, but not a digital meter.

Check the settings incase you have selected a high OHM or Low Current setting.


Edited by larrybl, March 29, 2016 - 01:44 PM.

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#7 Paulgo OFFLINE  

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Posted March 29, 2016 - 01:58 PM

Low battery in the meter? I can see electro-magnet affecting an analog meter as the meter movement is a magnet and coil, but not a digital meter.

Check the settings incase you have selected a high OHM or Low Current setting.

Had two tractors running 20 feet apart. Walked back and forth. Worked fine on one and freaked out every time I got near the battery on the other. Checked battery after shutdown and reading was just dandy. Started back up and away she went!


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#8 speedbird OFFLINE  

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Posted March 29, 2016 - 05:24 PM

It could be radiation from the ignition system. Check the plug, plug wire or try some shielding. It's a long shot but possible


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#9 Paulgo OFFLINE  

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Posted March 29, 2016 - 06:26 PM

It could be radiation from the ignition system. Check the plug, plug wire or try some shielding. It's a long shot but possible

I swapped the ratty looking plug wire for a nice one I had on hand. I wonder if it is the wrong type of wire??


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#10 JiminRI OFFLINE  

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Posted March 29, 2016 - 07:09 PM

Can you swap spark plug wires on the two tractors you mentioned? If the problem moves, you know it was the new wire.

Good luck,

Jim


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#11 Paulgo OFFLINE  

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Posted March 29, 2016 - 07:15 PM

Can you swap spark plug wires on the two tractors you mentioned? If the problem moves, you know it was the new wire.

Good luck,

Jim

That will be my next move. :thumbs:


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#12 Eric OFFLINE  

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Posted March 30, 2016 - 01:48 AM

Radiation? I have never heard of a battery putting off radiatin

#13 Paulgo OFFLINE  

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Posted March 30, 2016 - 07:57 AM

Radiation? I have never heard of a battery putting off radiatin

He was referring to the plug wire and coil next to the battery.



#14 Bruce Dorsi OFFLINE  

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Posted March 30, 2016 - 08:28 AM

I swapped the ratty looking plug wire for a nice one I had on hand. I wonder if it is the wrong type of wire??

 

These small engines like wire-core plug wires. 

 

Carbon-core (resistor) plug wires are not desirable.


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#15 toppop52 OFFLINE  

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Posted March 30, 2016 - 08:41 AM

Radiation of electricity from a bad wire, cracked insulator or from the coil, points, condenser, generator, magneto or anything in the electrical system can cause scatter that the meter will pick up.


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