Re: Ammeter - 450

Posted by Bob M on September 19, 2005 at 07:53:18 from (151.190.254.106):

In Reply to: Ammeter - 450 posted by Illinois Boy on September 19, 2005 at 07:16:06:

Presuming the ammeter's not wired incorrectly (and after a 12 volt conversion an incorrect ammeter hookup is always a possibility...), most likely the ammeter needle is stuck. And a stuck ammeter is not unusual for a tractor that's left outside a lot or where it's very humid.

A few checks (first 2 with the engine stopped):

1 - Turn on the ignition. The ammeter should indicate -3 amps or so. Or it will show a couple needle widths deflection to the left for the uncalibrated (D-0-C) factory meter.

2 - Turn on the lights. Ammeter should read about 10 amps (or about 1/3 full scale) discharge.

Now if the original ammeter was replaced with a -60-0-60 unit, the ignition may not draw enough current to cause it to show discharge on test #1. It should still however clearly show discharge when the lights are on.

3 - Take a good DC voltmeter and place it across the battery posts. It should read 12.4 volts or so. Now start the engine and run it at governed RPM. If the voltmeter now indicates 13.0 volts or higher the battery is being charged regardless of a "0" reading on the ammeter.

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