Posted by leej on July 15, 2012 at 16:47:23 from (99.104.16.60):
In Reply to: 6V vs 12V coil posted by low budget on July 10, 2012 at 13:22:47:
Quoting Removed, click Modern View to seeOH, yes!!!!!!!!!!!!!
did rig rig up the adjustable spark gap, ran the old IH coil both ways and I sure did prove a point! That b&d is DEAD WRONG!!!!!!!!!!
Connected originally as it was 6v pos ground , I got a neg polarity spark as expected & set gap screw to maximum that it would arc. Then, reversed battery connections on tractor & repeated and spark now has pos polarity and maximum gap setting that it will arc across is still same. So, same voltage just reversed polarity!!! Next, I reversed the two primary wires on coil & repeated and now I once again have a neg spark polarity, but the gap had to be closed inorder to obtain an arc. So, if you want the neg polarity, you have to give up spark voltage in exchange. Thus it is shown!
Circuit analysis had long ago shown this & except for those that haven't performed same, the imperical approach wasn't necessary or worth all the effor to disconnect, reconnect coil & generator (didn't want to re-polarize). Now, IF it is really important to you about those couple hundred volts & neg polarity (that is, you want tnem BOTH), then you can purchase a coil for a tractor that was factory Neg ground & it will have the correct winding sense (primary rel to secondary) to provide BOTH the higher voltage AND correct polarity.
So, what is your escape route now b&d???
You might actually learn something here, unless you are beyond the learning stage.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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