2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 183Get this manual
FUEL SYSTEM (Programmed Fuel Injection) 3Injector Input Voltage Inspection Fit the safety lanyard clip to the base of the engine stop switchMeasure the voltage between the wire harness side connector terminal of the No1 injector and groundConnection: Blackred (+) Ground () Is there battery voltage? YES NO Open circuit in the SIGNAL LINE wire Open circuit in the Blackred wireBlackred WIRE HARNESS SIDE INJECTOR 2P BLACK CONNECTOR (viewed from the terminal side)