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Re: + or - ground whats the difference?


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Posted by jdemaris on January 25, 2005 at 06:41:13 from (209.23.30.39):

In Reply to: Re: + or - ground whats the difference? posted by Dave (IL) on January 25, 2005 at 06:22:33:

The polarity matters with some ignition coils because some have internal ballast resistors and/or diodes and you need the primary current coming in at the correct end of it all. So, some coils it makes no difference at all, and some it makes a big difference. I've got some charts around for various coils and their test output (for use on an Eiseman Coil tester). Quite a few coils are polarity sensitive and show a 30% drop in secondary output if not polarized correctly.
A non scientific approach that I use, since many older coils don't have much if any information printed on them - is to simply try the coil both ways and observe the spark gap it will jump.
As far a differences in winding counts and AL versus CU with different ground systems? I haven't got a clue. If there are no diodes involved - and there ARE sometimes - then it shouldn't make a difference unless I'm missing something. Take a starter motor and try it both ways. I've seen absolutely no difference in performance or current draw - positive or negative ground. Same goes for generators - you just need to polarize them correctly. So, it seems the field strength does not vary. Different story if you're fooling around with starters with permanent magnets.


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