need electrial help. PLEASE

[culater]

I'm new at this stuff, could somebody tell me how to test a regulator. Also can they be fixed or do they have to be replaced

P.S. Are the green wires on yamaha + or -.

05 YAMAHA 200hp HPDI ( Z200 trld ) Thank you for your time, Tony

[99yam40]

Sorry to say it will have to be replaced.
At least I have never heard of anyone repairing one.
The green should be +