ive been doing this last night to be fair and on the ofab,ive got 1 earth wire 1 permanent live and 2 switched live to turn the ecu and injectors on does this sound pretty similar to yours,i found if i had one switched live off i wouldnt get a spark or injectors open,also worth checking you have put your switched lives to a permanent switched ie doesnt lose voltage when you crank the engine as this will cut the ecu power when cranking