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post #7 of Old 05-30-2011
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Originally Posted by Hartley18 View Post
FWIW, the main reason cars and boats were once wired for "positive grounding" (really "negative switching") and about its only advantage was that, wired in this way, it was possible to use a cute little 12V test-bulb to test for continuity at all points in the circuit up to the point of the final switch, making fault-finding relatively easy ...
I've only been out of bed for about (looks...) 15-20 minutes, and haven't had any coffee, yet, so maybe I'm missing something Really Obvious: But please explain why positive grounding vs. negative grounding (or "negative switched" vs. "positive switched," as you'd have it) is any easier to troubleshoot with a simple incandescent test lamp

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