Just to be absolutely sure disconnect the (bloody) wire from the mag ,then try again as someone previously said ,Dutch I think , the mag produces its own sparks without any outside power source required .Then with the end cover off remove the little bolt in the middle ,it's long and remove the points assembly from the mag and clean the points , if any burning on the points clean with wet and dry or similar ,if bad take apart and use a file to clean then reassemble and fit back into the grove in the mag tighten centre bolt ,check gap ,adjust to 12 thou ,then repeat at the second if close ok if miles out the cam ring kaput without some work . If you do this and still dead at least you know you're not wasting your money getting the mag reconned .