wiring ?

[jeepregal]

i have a old vip boat with a 1974 165 hp mercruiser inline 6 somewhere the wiring got messed up and can't seem to fix need someone to help connect the wiring in the correct path here is a drawing

problem i'm having is alternator is not charging battery or when you shut the key off the motor stays running (this is 2 different ways i have hooked up ) as you can tell both are wrong lol

 

[jeepregal]

No Title

here is pic

 

[glenn property of pam]

sounds like you have hooked a one wire alternator hooked to a key switched positive so when the key is turned off the alternator then supply's power to the coil keeping the engine running.
should go battery + to key+(common) then to a resistor (resistor wire/or a coil with a internal resistor) then to the coil +. Negative side of coil goes to the dizzy. With a one wire alternator (I hope its a marine alternator and not a car alternator) you just hook the wire to the battery (battery side of starter solenoid).
If you have a enclosed engine bay the first thing you should get to work correctly is the ventilation fan in the engine bay.

 

[wrench 3]

I'm afraid that no wires showed up on your diagram, but maybe this will help you. The original wiring on you engine would have had a red and white wire from the alternator to the ammeter. Since you are only showing a volt meter, I'm assuming that some one changed it up. They should have connected all the wires on the two main terminals from the ammeter together (red & white, red and whatever the boat manufacturer added). If this circuit can't be repaired, you could run a new wire from the alternator to the main circuit breaker. The terminal away from the battery.