Posted by Bob on October 03, 2008 at 09:42:46 from (69.178.228.68):
I've been working with an IH "M" that ran poorly and wouldn't accelerate. Had a bad coil, and one bad plug wire. Here's the automotive ignition scope patterns showing the problem.
The tractor had a botched 12-Volt conversion that bypassed the intended converting resistor, and overheated the coil and the points.
It now runs GREAT with it's new NAPA IC14SB TRUE 12-Volt ignition coil and NO converting resistor.
The owner has some chores to get done with it, and we'll put it back in the shop after freezeup and deal with the loose distributor shaft issues.
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