Re: Wiring Diagram
Most of the mercury service manuals have been taken off line so this is pretty difficult to come up with now at no charge.
Bout the only thing you could do is post the serial number so maybe someone would be able to find the correct service manual part number for you and either let you know where to find it the cheapest with a google search or maybe by chance someone has it and will recognize the manual by part number.
Hope this helps, Good luck.