Circuit Breaker

[Patriot]

I have a main circuit beaker under the oil tank could you know which wire went to the copper stud .I had one black wire when I took it off and 2 brown on the other but forgot which was to the copper stud.I replaced the starter which was broken at the casing have repaired it,but now when I connected my wiring at first I accidentally connected the regulator earth instead to the circuit breaker .When ignition switch turned on the neutral,oil and main beam started glowing bright and dim.Including a clicking noise also from somewhere near ignition switch.Open to any idea's.CHEERS