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-   -   Mefi 3 vs Mefi 4 (https://www.offshoreonly.com/forums/general-q/385873-mefi-3-vs-mefi-4-a.html)

800XCR 07-10-2025 01:07 PM

Mefi 3 vs Mefi 4
 
What is the easiest way to tell if the engine harness I have is a Mefi 3 or Mefi 4? I don't want to plug my Mefi3 in and fry it.

F-2 Speedy 07-10-2025 01:45 PM

I dont think there is a difference or two different harnesses

articfriends 07-10-2025 04:53 PM


Originally Posted by F-2 Speedy (Post 4930106)
I dont think there is a difference or two different harnesses

a mefi 4 harness is Definitely different then a mefi 3, now a mefi4, 4a and 4b use same harness.

F-2 Speedy 07-10-2025 05:01 PM


Originally Posted by articfriends (Post 4930130)
a mefi 4 harness is Definitely different then a mefi 3, now a mefi4, 4a and 4b use same harness.

Well Smitty learn something every day, does power and ground go in on the same pins on a 3 vs 4 ?

articfriends 07-10-2025 05:11 PM

1 Attachment(s)
so if you open both these, take a look at j connector legend, the mefi3 one is on page 7-24 to 7-27 and tells you color of wire in the j connector cavitys, you can compare it to yours
Attachment 577908
https://marinepowerusa.com/wp-conten....2L-502CID.pdf

800XCR 07-10-2025 08:27 PM


Originally Posted by articfriends (Post 4930133)
so if you open both these, take a look at j connector legend, the mefi3 one is on page 7-24 to 7-27 and tells you color of wire in the j connector cavitys, you can compare it to yours
Attachment 577908
https://marinepowerusa.com/wp-conten....2L-502CID.pdf


Thank You!


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