cdi box

First let me start by saying this is my first vulcan ,found it in a Harley owners garage it came with a clean title and 33k miles on it ,i am now the owner and only paid. 350$ ....the problem.the bike gets spark if one coil is hooked up.but if i hook both coils up there's nothing to either coil...

Okay,first let me start with the problem.the bike gets spark if one coil is hooked up.but if i hook both coils up there's nothing. I've tested both coils and they both work. Pickup coils work because if they were bad i wouldn't get any spark at all....right? The only other thing is.....the cdi...