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Tom Wesenberg · 12-21-2013, 02:53 PM

Most likely a poor electrical contact in the coil primary circuit, which includes the points contacts. After setting for several weeks in humid weather my 28 failed to give good spark while cranking with the electric starter, but fired right up with the hand crank. And this even happened after I cleaned the points contacts. Once it fired up by hand then the starter fired it right up just fine for the rest of the summer.

When I worked at the GM dealership some of the points wouldn't work, even new straight out of a sealed box. All it takes is a bit of skin oil from someone touching the contacts, or light corrosion from humidity. This is rarely a problem, but over the years I've had it happen a few times.

12-21-2013, 02:53 PM	#48
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Whats happening here Most likely a poor electrical contact in the coil primary circuit, which includes the points contacts. After setting for several weeks in humid weather my 28 failed to give good spark while cranking with the electric starter, but fired right up with the hand crank. And this even happened after I cleaned the points contacts. Once it fired up by hand then the starter fired it right up just fine for the rest of the summer. When I worked at the GM dealership some of the points wouldn't work, even new straight out of a sealed box. All it takes is a bit of skin oil from someone touching the contacts, or light corrosion from humidity. This is rarely a problem, but over the years I've had it happen a few times.