coils 1 & 6 fire together, coils 3 & 5 fire together, coils 1 & 7 fire together and coils 2 & 8 fire together
On the 4.6L during the firing order of 1,3,7,2,6,5,4,8 all 8 spark plugs will fire during 1 engine revolution. The system is really 4 coils with 2 plugs firing on each coil pair, if that makes sense. So you have lost the +12vdc or -12vdc to the 3&5 coil pack. Good luck and I hope that helps.
On the 4.6L during the firing order of 1,3,7,2,6,5,4,8 all 8 spark plugs will fire during 1 engine revolution. The system is really 4 coils with 2 plugs firing on each coil pair, if that makes sense. So you have lost the +12vdc or -12vdc to the 3&5 coil pack. Good luck and I hope that helps.