Originally Posted by mandolindave
I'm thinking that the frame would be hot, if the polarity is reversed, even if you didn't have a warning light.
I perceive your comment to mean that a faulty warning light could cause the exact problem that is supposed to be warning you against. Am I correct????
The main difference is that the bulb limits the current, which is not the case when the Polarity is reversed. The neon bulb will not light and pass any current until the voltage across it is above the ionization potential for neon which, if I recall correctly, is about 90 volts. This won't happen unless there is a low resistance connection between the frame and ground. If the tongue jack or stabilizers or body contact provide this the bulb might light and energize the frame but the available voltage would only be about 30 volts. That's better than 120.
But it is zero if the bulb is replaced with a plugin tester.
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