BF75 - Broken Grounding Wire

[Rattletrap50]

Hi all, im struggling to find out what this grounding wire does, where to find a replacement, and service manual to replace it. Any help would be greatly appreciated.

https://flic.kr/p/2oBs8A6

 

[Alan Hicks]

Myself, I wouldn't worry about it. Electrically, it's just not necessary. I'm not sure why Honda installs these....

 

[jgmo]

That's a "bonding" wire. It's intended to provide a path to ground for static and stray electrical currents that get generated as the outboard moves through the water. It is supposed to help deter the galvanic corrosion that the current can cause.

You could make your own replacement or order it from www.boats.net
See item 7 in the link below.

Honda Outboard 75HP OEM Parts Diagram for Gear Case + Extension Case | Boats.net

Buy OEM Parts for Honda Outboard 75HP Gear Case + Extension Case Diagram

www.boats.net

 

[bobmech]

As jgmo said it's a bonding earth wire & should be replaced if broken. Sometimes if the engine main earth wire is not making a good connection, the starter motor earth current(250 amps) when cranking will instead travel back to the battery via that bonding wire & cause it to melt & break due to the high current which it's not designed for. So check your battery earth cable. The other possibility is that the bonding wire was snagged on something which caused it to break.

Bob