Merc 4.3 mpi wont crank and has no power to radio

[Kane]

Hey guys, 2013 crownline with 4.3 mpi, basically the key does nothing. no crank, no ignition beeps and no radio. battery test good, we have checked and tested the 50amp breaker, the 20 amp ignition fuse and all other fuses in the boat. not sure what else it could be??

 

[NHGuy]

If the gauges come on with the key, check that the emergency lanyard is in position. Also be sure the shift is in neutral, there's a starter kill in there too.

 

[Kane]

The gauges are not coming on, no audible ignition beeping. we checked the emergency lanyard and it is in neutral. Im gonna go over and test the switch itself. run a jumper and see what happens

 

[Bt Doctur]

Why not check to see is all the battery cables are hooked up first, then jump the slave solenoid to verify the connections, then go to the dash area.
Guessing the trim motor does work.?

 

[Kane]

all the other accessories work. the lights, blower, and trim. just no radio or audible ignition beeps and engine wont crank. a bad slave soleniod wouldnt explain why I have no radio when I turn key to the left

 

[Bt Doctur]

you short the slave to verify you can pass starting current , this tells you the battery cable connections are good. Then you look at the main harness plug for any corrosion and to make sure the pins are greased and the clamp is tight. then go to the red wire at the ign switch and check for 12v

 

[Bt Doctur]

you short the slave to verify you can pass starting current , this tells you the battery cable connections are good. Then you look at the main harness plug for any corrosion and to make sure the pins are greased and the clamp is tight. then go to the red wire at the ign switch and check for 12v.
electricity is wonderful stuff but needs a positive AND an negative to pass current.