2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 163Get this manual
FUEL SYSTEM DIRECT INJECTION ELECTRICAL CIRCUITS
DIRECT INJECTION ELECTRICAL CIRCUITS
The outboard's 55 alternator circuit supplies the injectors and fuel circulation pump with the current required to activate the fuel injectors and pumpUnique circuits from the EMM distribute this current to the specific injector or pumpThe EMM controls injector and pump operation by rapidly connecting and disconnecting one side of each component's internal coil to groundCurrent must flow from the EMM to the injectors and pump, through the winding of the component,
back to the EMM, and through the EMM to groundThe injector's internal coil provides approximately ohms of resistance in the injector circuitRequirements for injector or circulation pump activation: 55 output from the alternator to the EMM and through the individual circuits; and Switched ground connection provided by the EMM