Re: Wiring Diagram for 1984 merc. 350 5.7 260hp
I don't think you will find any help in the link Bondo gave you above, the manual you need is #3 and isn't even listed and isn't online anywhere.
There were several ways of wiring the 5.7's back then, depending on volt meter or amp meter, which alternator etc. But here is a basic idea of what a Merc wiring diagram looks like and is fairly close to what they were back then.
Perhaps you could tell us what your problem is and we might be able to help. If all you want is a wiring diagram for future reference, I would suggest you get the OEM manual and (#3 pn 90-95693) and compare it to what your engine actually is.
