502 mag mpi no start
 

boat was running fine, anchored off for a while and went to fire it up and it just clicked. Got it towed home and found the clicking was coming from the solenoid on top of the motor. Replaced that along with the two relays and now I'm getting nothing. Everything is tight and batteries have good connection. Fuel pump turns on but that's as far as it goes

Just a thought We had this happen to us last weekend Found corrosion on starter connections Cleaned them up Vrrrrroooooom!

Get a test light or volt meter and test for voltage in/out slave solenoid(which U replaced) along with at starter.

Mine vapor locked last weekend. No fuel press. Crank and bleed. WOT and it finally came to life. First time for me.

Workshop manual gives many scenarios and their possible causes.