Merc 3.7 Wiring Diagram

Blentz17

Seaman Apprentice
Joined
Feb 13, 2018
Messages
49
I have a Bayliner with a 488; when i bought the boat, the helm gauge wiring was corroded to the point where it needed to be replaced. So far I have replaced the main engine harness and all of the wiring to the accessory switches (Bilge, lights, ect) but not I need to replace and clean up the wire mess behind the helm controls. Ive looked high and low on Google and in other forums for a wiring diagram for the 3.7 but not surprisingly most diagrams are for the 3.0.

Looking at the 3.0 diagram it seems similar in some ways but very different in others. Has anyone come across a wiring diagram for the 3.7 or have you used the 3.0 wiring diagram to rewire the boat
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
48,234
the factory service manual has wiring diagrams.
 

Blentz17

Seaman Apprentice
Joined
Feb 13, 2018
Messages
49
Any advice on where to find the manual, I have been looking on emanuels and have found every other 3.7 but the 488
 
Top