BMC 1.8 ground wire

[AndrewV]

Hi!

New to this forum and to engines.

Trying to clean up wires and rewire BMC1.8 engine.
Have positive wire from battery connected to solenoid, and negative - to starter motor (changed them to new ones)

Do i need additional battery negative wire connection to engine block (ground)? (was not able to locate such wire).
If yes, maybe someone can suggest - where it should be attached on engine?

 

[Tracy D'arth]

Any  large bolt/nut on the engine block close to the starter motor, back to the battery negative terminals and to the hull close by on a separate bolt from the mains land line earth if there is one.  Use 25mm2 cable as a minimum. 35mm2 better.

Edited September 26, 2023 by Tracy D'arth

[Tony Brooks]

Often connected to an engine bed rather than the actual hull on a steel boat.

[AndrewV]

Thanks for hints!

Will get proper size cables and will modify current wiring during next days.