John T said: (quoted from post at 08:30:30 03/15/09) Good info Dell, for the record its easier to emit an electron (a negativley charged particle) from a hotter surface (spark plugs electrode tip) to a relatively cooler (plugs ground strap) surface. Thats what all the Pos or Neg ground versus how the coil's wired (its polarity) has to do with. Its the same reason in a vacuum tube a heater is under the cathode to emit electrons up to the cooler plate
John T Electricity NERD lol
Pos or neg battery ground has nothing to do with the spark. THAT is determined solely by how the coil is wound/ wired/ connected, or maybe I misinterperted what you were trying to say
So far as alternators, you "could" change some alternators to positive ground---such as the older GM/FORD/Mopar ones with the old individual diodes, by removing all six diodes, and swapping the two sets of three around.
So far as generators, you can run a generator either way. what DETERMINES "ground" is the way it's "flashed" (which you can change) and the construction of the contacts in the regulator. SOME aftermarket/ replacement regulators had heavier contacts and could be used either way. I used to sell auto / truck parts, and remember that some part numbers in Standard Motor Products (Blue Streak) showed this
There WERE some fairly modern trucks made in 12V pos. ground. Don't ask me for the brands, I think some were firetrucks. I've been around Motorola two-way, and at least some of their radios could be configured and or ordered for pos ground 12V use, and "we" had to order at least one 12V to 12V inverter for one customer--to run some neg. ground gear in a 12V, pos ground truck.
(Personally, I'd 'ha changed the truck ground!!)
I'm of the age to remember 6V cars, Ford didn't "come over" until 56, VW until later, what, 63? Personally, I think "we" should all have 24V cars, but now that the hybrid fever has ??hit?? that may be moot. I'm glad I'm getting old. As an amateur radio op, the new cars are crap for radio noise/ interferance, and my understanding is that the hybrid breed is pretty bad. Not only that, but the "standard" of 12V accessories may be gone in a few years
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