Posted by Tom Fleming on August 28, 2012 at 04:09:59 from (173.233.9.252):
In Reply to: Farmall H4 Magneto posted by MarkinOhio on August 27, 2012 at 07:13:44:
Well, let's be careful here. The H4 coil is absolutely replaceble and a better way of putting it is that the coil is enclosed. The coil cover does have a contact tab on it for the output. If the contact tab is not making appropriate contact with the high side of the coil, then yes, it could have intermittent spark. That contact tab also has to be clean and free of corrosion.
I can see where if the contact tab was barely touching the coil, upon being heated, it could have enough air-gap to not work properly.
In any case, good for you that you located the trouble.
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