Wiring Harness for Mercruiser 454 carbed
 

How do I know which is the correct wiring harness to purchase? I am rerigging an older boat and have a 454 Mercruiser carbed motor. There is not much help out there on this subject that I have found. Thanks

Here's a good place to start looking. search with pictures.
Look for late 80's or early 90's. I just got a harness to convert my 502 mpi to a carb. Gives me all gauges and alarms.
Part # 84-847722A2
They run around $300 for new.

http://www.mercruiserparts.com/SelectProductLine.asp

thanks bro, I didn't even know where to start. TM

C P Performance sells a kit where you can make your own length wires and custom fit the harness to your engine. About 150 dollars.

I will check into that, thanks

Whats the differance in the MPI harness and the carb harness? The reason I ask is i have a 1991 7.4l 454 hraness he can have but we are not sure if it will work since he just found out the motor is a 98 mpi that has already been converted to a carb.

On an MPI motor the are actually two harnesses. The engine charging harness and the efi harness wich pluges into the the charging harness. With a mefi 3 ecu some of the sending units wires go throuh the the ecu. You can split the two. you will need to do a little more wireing.

Not sure how to attach a picture here. I have the wireing diagram if you need one.

That would be nice. Email it to me. Thanks

I'm only a registered user. I can't see your email address. If you could post it, I"ll scan the the diagram and email it.

Mike