02 350 mag mpi, no warning horn, crank, no start. Help

hd12121

Member
May 13, 2009
61
GULF OF MEXICO
Boat Info
2002 310DA
Engines
TWIN 350 MAG MPI
I have a 2002 310DA with 350 mag mpi v drives. Boat has been idle for 3 months. Turn on ignition and no warning horn sounds. Also no audible fuel pump pressure up. Engine cranks won't start. Same situation for both engines. Turn starboard ignition on and the auto fire extinguisher light goes on. Turn on port ignition and auto f.e. Light does not go on. Simultaneous catastrophic component failure unlikely (I hope) seems like wiring. Any thoughts?
 
hd12121, My first thought is not to get rocket science syndrome. You need fuel, you need air, you need spark, and you need compression. It Sounds like no-fuel is your suspect. (Based on crank, but no-start, and no fuel pump sound on key-on)Get a can of ether, see if you can get the engine to light up. My best guess would be the start switch contacts have corroded. This based on no buzzer when the keys are switched on. I would guess some contact cleaner and a check of the switches and ignition connections are order, but the ether will confirm if you are on the right track, and it is an easy test. Probably goes without saying but I always check the fluid levels, and gear selector position before I get in to any diagnostic. I have worked pretty hard to figure out someone bumped the shifters out of neutral.
 

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