Wiring diagram for what? Are you wanting to wire it to a boat and instruments, or are you looking for the actual engine wiring (under the cowling) if it's the actual engine wiring, you are going to need the service manual. You will also need some more numbers off the engine to get the proper one. http://www.yamahapubs.com/index.do?pg=search&category=4
I am tring to hook it up to remote controls that where hooked up to a 2004 yamaha F50 but I have one plug left on the control side with no where to plug it in on the engine
