Posted by ScottyHOMEy on April 05, 2008 at 15:32:13 from (71.241.213.254):
'47 BN with an H4 mag, and I'm suddenly getting no spark. It was running just this past week.
When first started last spring after the engine rebuild, she fired and ran on the third pull of the crank, so the setup and timing have been good. She's run plenty since, though a few times she took a while to start (with the starter). I'd chalked that up to carburetion, but maybe not. Over the winter, the last few starts have been a matter of her firing maybe ten turns weakly, dying, and retarting only after some serious time on the starter.
I've had the mag off and back on twice today, after she wouldn't start at all. First time, changed out the condensor, touched up and checked the gap on the points. Second round, double checked the points, put yet another condensor in. I pulled the coil off to get a better look at the wire where it passes through to the points. It looks good and I had no continuity from the arm on the points to ground. I'm thinkin' it might relate to condenation (it livess in an unheated garage) as there was a film of rust I don't remember on the magnets, and on the rotor that becomes visible under the coil. Cleaned those up.
Still no spark to the center wire coming from the cover of the mag. The rotor in the cap is on.
Any thoughts? More things or ways to check it out?
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