Originally Posted by EPNCSU2006
Is this in-line with the negative coil wire, or just probe with it connected? Wouldn't the test light just ground the coil if the negative wire was still attached to the coil and be on all the time?
With all of the wires hooked up the test light will flash as you crank the engine probing the TACH side. No not in-line with the negative coil wire.