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testing ignition switch

Posted by dallen54200 none (My Page) on
Mon, Mar 17, 14 at 13:53

Greetings to all. I have a Craftsman 20.5 HP lawn tractor Model # 917.270840. Can anyone tell me how to check for a faulty ignition switch? Thanks


Follow-Up Postings:

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RE: testing ignition switch

You need the correct electrical schematic for that exact model tractor and either a test light or an ohm meter and basic automotive electrical knowledge.

Lacking either usually results in a more complicated problem and ultimately a more costly repair.

Sears lists two manuals for the 917.270840... here is the schematic from one manual but it may not be the correct one for your tractor.

Perhaps it would be more prudent for you to post what problem you're having and we might point you to the right place to start diagnostics.


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RE: testing ignition switch

Note in the schematic above, that there's a "Truth Table" on the lower left of the page.
That shows what connections should or should NOT be made in the different key positions.


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RE: testing ignition switch

Thanks, I think I figured it out.


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RE: testing ignition switch

Thank you for sharing your findings with the forum.
That's how this works.


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