No juice from MSD box

Got a fairly new 6A box. Car has been sitting for 6 months and tried to start with no spark. MSD box has 12v going in but nothing coming out to coil. Orange wire to coil has no juice. Is the MSD box bad? We did a large welding project on car with battery disconnected but left the box connected. I'm thinking maybe that is what fried it. Any troubleshooting tips would be helpful