Re: 1987 Mercuriser 7.4 wiring diagram
If you google enough, you might be able to find the service manual you need in .pdf form on the web. Merc has made it difficult to keep any copies online, however.
This picture is from Service Manual #7, and may help, but I can't be sure this is the same setup as yours.
If you want a higher resolution version, drop me a PM with your email address, and I can email you a copy.
