I'm assuming you are running a MSD box? What Crackedback said, that box and the coil need to be fed in ign1 (run) and in ign2 (cranking) & actually the OE system needs to be also and that ain't being done the way you have it wired right now (your coil & box are OK) tho you might benefit slightly from going to the MSD coil and there might be a longevity bennie related to MSD box/using OE coil combo (I ain't sure on that). Short version: post what system you have and how you have it wired & if you have that correct then with your VOM see if everything is being fed with the key "on" cuz that is when it is going dead