Posted by Steve@Advance on February 20, 2022 at 18:29:49 from (99.190.215.237):
In Reply to: Ford5610S posted by ford1956tractor on February 20, 2022 at 13:50:11:
A milliamp meter is best, an incandescent test light will work.
With everything off, disconnect the negative battery cable, connect the test light or amp meter in series between the battery post and the cable.
A reading of 50 milliamps or less is good. A dim glow on the test light is acceptable.
It is normal for an alternator to have minimal draw. If less than 50 milliamps, or a dim glow, it is ok. Unplugging the alternator may drop the draw but doesn't necessarily mean the alternator is bad. If there is substantial draw, or the alternator is warm after sitting long enough to be completely cooled down, it is bad.
Any electronic accessories may also contribute to the draw, and that is also normal as long as the accumulative draw stays under 50 milliamps.
If there is a higher draw, start disconnecting accessories, unplugging harnesses, removing fuses until the draw drops. Also look for corroded connectors. The corrosion is conductive and can cause a drain. A wet, dirty battery with corrosion around the terminals needs to be cleaned up.
A bad battery can also mimic a draw by self discharging.
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