Quote Originally Posted by Flyinglizard View Post
Con, I always assume that the main power has been checked..
Just turning the power on and off will trigger a spark @ the coil, if the power supply and ground are valid.



Not talking about the power, I'm talking about how to check for actual signal at the coil, same applies for electronic fuel injectors and many other parts. You can tell if there is a square wave present on the signal wire with a simple test light hooked to the positive side of the battery.