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Message: <blockquote data-quote="julimike54" data-source="post: 228209" data-attributes="member: 4126"><p>Looking at the above underlined.  My understanding is the Black/White is "hot" all the time, in normal operation.  The Blue or Yellow is how ground is supplied to the coils, hence the hot now has a ground and the coil will fire.  The grounding is controlled by the Ignition Control Unit (ICU).  Without the signal wires connected to the coils you may not see a change to the Blue or Yellow wires.  If you have an open coil winding the circuit would not complete either.  I'd check your primary coil windings Ohm value to see that both are equal in value and that neither is 'open'.  You need to have at least one of the wires off both coils the check this or you could get a false reading.</p></blockquote><p></p>