Hello! There is a wiring multiple between the four coils of the Red and Black
(+12 and Ground) wiring that may have opened up during the head replacement...On Coil #1...Pin #3 is a Red wire and on Pin #2 is a Black wire...It is the same on Coil #2...Using two safety pins...Push the points into the Red and Black wires...First on coil #! then #2...Set your meter to read 12 volts...Clip the (+) meter probe to the safety pin in the Red wire and (-) to the Black...Turn on the key...12 volts must be present...You can check the other two coils that are firing...More than likely those two will read OK...This is a preliminary test to insure #1 & #2 have the proper voltage...Send a comment with results and I'll take it from there...Guru...Saailer
I’m happy to help further over the phone at
https://www.6ya.com/expert/david_6df67de3b14de867
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