hi all my mate is round with his a10 57 flash, he put a new dvr2 on last night and now has no charge ,its 12v poss earth with magneto, looking at the wiring we have GREEN TO FIELD---YELLOW TO DYNAMO---WHITE NOT CONECTED---BROWN TO AMMETER now what i think may be wrong is he has cut the brown wire and conected it to the dvr2 ,should this wire also go to the neg post on battery----poss earth bike ,dont want to try without contacting forum first, thank you mal.