I kept the 1932 ground wire
clip, but with a modern grounded power cord it's not needed for
grounding.
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The wire clips onto the plug
being tested. Air pressure is applied to simulate compression in
an engine. In tbis case it's set at 60 psi, which is more than
Model T engine compression of 45 to 50 psi..
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If the plug is OK, pushing the
button fires it and you see the spark through the little window.
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Wire brush clean.
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Left: cleaned. Right: bluing
applied.
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Tested and ready to use.
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