Originally Posted by Polwart
John, I would disconnect the battery then measure the resistance between the two points I marked in green on your diag. I don't know what it should be - but if you know the spec of the fuse we can tell you what it shouldn't be! One thing though - do you not have "start in gear" protection on your engine? as that would add some extra wiring (and potential for faults).
Going to have to go buy a multimeter, always avoided electrics up until now. Bloody boats!
When I get one I'll give it ago (thanks again for all your time
The fuse on the ignition is 20amp
I'm not 100% sure but I think my OB doesn't have a start in gear protection under the hood. It's in the 703 control.