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Hi,
The wire could be broken along the entire length of the harness and corrode through a pinhole in the insulation. This makes a VOM check useless until the fault actually exists.
Since your dashboard light works as it should at all times you might do well to replace the entire fat red wire.
What I meant by "aftermarket gauge" was a permanent voltmeter installation like you have on aircraft, submarines, or where it really matters if something goes wrong. With this gauge mounted to the dashboard, you will know if there is a problem before the car dies in the street.
Goatman
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