Re: Yayyyy its alive!....and now its dead....AGAIN!!?

Posted by sgtslag on Sep 21, 2012; 9:14pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Yayyyy-its-alive-and-now-its-dead-AGAIN-tp4029515p4029541.html

The coils transform low voltage/high current, to high voltage/low current, which jumps across the spark plug gap, firing the fuel-air mixture.  If you disconnect the spark plug wire, you open the high voltage side of the coil (transformer) -- and, yes, this has the potential to burn through the insulation on the output (spark plug) side.

The OEM Service Manual should give you the resistance reading on a good coil, for both the primary (12 Volt) side, as well as the resistance reading/value expected on the secondary (high voltage/spark plug wire) side.  As to how to connect the leads on your meter, that would depend on the meter you have -- check the user's manual (may be available online, if you no longer have it).  Multi-meters vary by manufacturer.  Cheers!