Voltage reading

M

Mort

Senior Member
So was testing my voltage with a multimeter and found that while the car is off, I am getting a reading of 6.25 volts but, when the car is running the meter gyrates all over the place, no constant reading. I took it from a number of places (generator output, ele. box on firewall, connection on top of starter) and still the same when running. I have a feeling the meter is fine; so what could it be?
Thanks
 
You need an analog meter, not the digital one it sounds like you are using, as they are prone to the RF interference of the non-shielded ignition. Sometimes older is better!
 
I agree with Rich, analog is the only way to go. A bad connection in the charging circuit can cause high voltage. Do you use a fuse? Are the fuse clips tight, if you have one?
 
An excellent analog meter is the SPERRY SP-152A sold at Menards for $20.

In addition to the common scales, it also has 1 1/2 and 9 volt battery check, a buzzer continuity check, and a 20 amp scale, which is handy to check the headlight draw and accuracy of the Model a ammeter.
 
Thanks! No Menards in New England but with name and model number should have no problem finding it.
 
Tom Wesenberg said:
An excellent analog meter is the SPERRY SP-152A sold at Menards for $20.

In addition to the common scales, it also has 1 1/2 and 9 volt battery check, a buzzer continuity check, and a 20 amp scale, which is handy to check the headlight draw and accuracy of the Model a ammeter.
Click to expand...


Great, just got one on Amazon for $11.00 plus $5.95 for shipping.
 
Mort, glad you found a good deal on the Sperry meter. I go to second hand stores, such as Goodwill and Salvation Army and can find a small zipper bag to carry the meter in for a buck or so.
 
I wanted to check the voltage on my 46 coupe as well with a multi-meter. Good point about the analog. What should the voltage read while the car is running if the charing system is operating normally?
 
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