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The answer is simple... the digital meter you are using is not sufficiently shielded, or simply cannot filter out the electrical noise generated by the ignition and charging systems on the old tractor. One source of the interference is the solid-core (non-suppression) spark plug wires required by the 6-Volt system. This is a common problem, and this information has been posted often, before, on these boards. There are analog meters available for $20.00 or less that are plenty accurate for use on these machines, and, having no "solid state" electronic components, they are not adversely affected by the electrical noise. Or try a different digital meter. A higher $$$$ one MAY function better in the "electrically noisy" evironment created by the tractor's electrical equipment. As to your other tractor, the "12-Volt" one, the battery voltage, if the charging system is functioning, should be in the 14.5 to 15.5 Volt range.
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