Posted by MarkinOhio on August 28, 2012 at 08:37:57 from (206.211.222.52):
In Reply to: Re: Farmall H4 Magneto posted by Tom Fleming on August 28, 2012 at 04:09:59:
Tom, my thoughts were also that there would be some corrosion on the contact tab but it was clean and seemed to be making good contact with the coil. I shined it up anyway with a piece of fine sandpaper and it made no difference. I did do a little experment last night with wifey's hairdryer. With one ohm meter lead connected to one end of the spring tab and the other meter lead to the well where the coil wire plugs in I was able to lose continutity after heating the coil cover for about 2 minutes. After cooling down for about 30 seconds there was once again continuity. So it is definately heat related. That coil cover might have been on there since my grandfather bought the tractor new in 49. At least I don't remember it ever being changed in my 62 years.
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