Pull the plug boot off. stick in a screw drive and ground out next to the head or bolt (hole out about 1/4 in). pull the cored to see if you have spark. ( pull the plug out, it'll help to pull the cord). now if you have no spark. find the coil and remove the black ground wire, and check again. if you have spark, than the switch or wiring is bad, if not, the magnetron is bad . good luck
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You don’t have to bend up the electrode. HTH
Lou
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