marine power 340HP wiring diagram and DLC connector location needed 2008, MEFI

i am working on a 2008 marine power and it started fine this season, but once in the water she died after running like crap, now i get no crank, dash info says no power detected from ECM. i looked all over the place and can't find the DLC connector to plug the scanner in and check the ECM. i did find 3 wires tied back by the ECM with wire conectors on them, orange, white and blue. i am thinking the conector should be there and the PO did something. the boat is new to my customer this season.
also, if anyone knows were the engine info is located, i would like to see that as well. its a small block engine so im guessing its a 6.0

i checked poower the the main breaker on top of the engine, thats ok, battery is good, i jumped the starter and the engine spins. but turning the key gets nothing, no fuel pump hum, no solenoids clicking.

thanks guys

Not an ECM kind of problem... find out why there is no power either to or from ignition switch start circuit to engine.

ok, ,so i finally found the DLC connector and sure enough, no ecm found, so i am now trying to run down why suddenly she would run poorly and then shut down completely with no power to ecm after that.