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Farmall & IHC Tractors Discussion Board

Re: voltage at alternator reading


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Posted by Gene-AL on October 20, 2007 at 17:27:29 from (74.242.20.239):

In Reply to: voltage at alternator reading posted by keith smith on October 20, 2007 at 13:42:33:

Keith,
You said: " i took out the amp meter and put in a voltmeter..."

An ammeter is almost an electrical short circuit between its terminals and carries the full alternator charging current to the battery. A voltmeter is almost an open circuit (high resistance) and will carry (at most) about 0.001 Amps reading a full-scale voltage.
If I understand you correctly, what you did was to put an effective open circuit (Voltmeter) between the battery and the Alternator by installing a voltmeter in place of the ammeter.

The wires that you removed from both terminals on the Ammeter should all be connected directly together (a short circuit in place of the removed Ammeter) and then add the +(HOT) terminal on the voltmeter with them (i.e. tie all the wires to the Voltmeter (+) terminal). Connect the other (-)voltmeter terminal to a ground (tractor frame).

Your battery seems to be either in need of a charge or has lost its charging capacity due to old age or a defect, according to your description. Hint: Clean your battery terminals & posts to "bright and shiney" and examine the cables for corrosion or broken strands first.

Be Safe! dont work with the wiring without first disconnecting at least the battery Negative cable.


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