Re: 70 HP Evinrude
as mentioned the blk yel wire off keyswitch is kill,check and make sure it is attached to switch and also a blk.ground.the key switch puts ground to the powerpack,killing the engine,if either wire is not connected to the switch it cant kill,also check the groundwires on the engine,possibility of the ground to kill switch is disconnected, check the main plug,if the contacts that join the necessary wires are dirty ,with corrosion its possible the problem could be there as well