What's the two little posts for on the universal solenoids? I know one is to connect to the ignition but what the hecks the other one for? In a lot of applications, there's nothing connected to it.


Also, On a magnetron module, what does the little black ground wire connect to? If I run it to a ground, there's no fire, duh. But what do I connect it to so when I turn the key to the off position it works?
thanks guys.