2001 Mercury 90hp 4 Stroke

[jkilburg]

I've done some searching on this topic, and an old post brought me here. I have a 2001 Mercury 90hp 4 stroke (Serial # 0T340206) that I wanted to swap the RR on. No big deal, order my new RR. I get it and notice that it does not have the wire for the tachometer. I understand, this is probably the best option, since the RR has a tendency to have issues. But, this brings me to my next issue, and that is the harness. I really do not want to spend the $300+ for the part number 8042903. That would take the project from a simple/cheaper project, to an expensive project. What I am looking for is a better wiring schematic, or picture of the actual harness with the extra green wire for the tach. I am going to see if I can find one that is off a part-out and match it up that way to save me some money.

So, can anyone help?

[jkilburg]

Someone has to have some good info that can help. Mercury’s response is to buy their $650 kit, and that’s just nutty.

[EuropeanAM]

Don't mean to be dense, but it will help if you spell out what you are referring to as "RR".

[jkilburg]

Don't mean to be dense, but it will help if you spell out what you are referring to as "RR".

Regulator Rectifier.