Posted by oldtanker on August 28, 2011 at 16:52:33 from (66.228.255.223):
In Reply to: Case electrical system posted by teddy52food on August 28, 2011 at 16:21:28:
teddy52food said: (quoted from post at 16:21:28 08/28/11) Read his post. He has the coil hanging loose & the spark is jumping to ground to complete the circuit. Normal.
I did read his post and while working as a mechanic when confronted with a coil would always hook the new coil up without installing to be sure it was good before mounting. Some coils do have a body ground to suppress raido noise but nothing that passes electricty should be in contact to the body of the coil. Electricty goes through the coil to a switched ground called points or the trigger on IE. Now if the enternal coils were gounding to the body the tractor wouldn't even start because the coils would be shorted out all the time. Now a bad coild on the 2nd winding could jump enough to casue the sparking and not allowing the full discharge to go to the plugs....hence the rough running. Look at a front mount distributer on a Ford N series tractor. The body of the coil is plastic. One wire in that supplies power to the coil, one contact that goes to the points and one to the cap. No ground except the one to the points. points closed completing the circut builds power and when they open the coil discharges that power to the plugs. I may not have explained it well but thats how they work.
Rick
Rick
This post was edited by oldtanker at 00:02:26 08/29/11.
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