Exhaust flame thrower help

[pokertramp]

I have pretty much everything I need but I am stumped on one spot. I got the relays buzzing, which is cool btw.

It says I need a capacitor or condenser from an ignition coil. It shows a positive and negative but with a condenser you only have one wire on it. Can someone explain this to me? Do I use the case of the condenser as the negative output? here are the plans...

http://rides.webshots.com/photo/1064279 ... 8684FywQrq

 

[megaladon6]

if the condensor has a metal case, that's it.