Thread: HEI voltage drop ?

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I have been tring to track down a miss on my small block chevy and while checking to make sure everything was getting pllenty of juice I found that on my hei hot wire from the key switch has steady 13 volts at the cap,But after the motor is running the volts jump all over the place.As high as 14 and as low as 1 or lower.How can this be right?Shouldnt it have a steady 13 volts or more at the coil all the time it is running?Could it be in my tester?(which is new)Is there something I am missing or is there a problem in the system?I even ran a hot wire right from the battery to the hei and it does the same thing. Voltage is fine untill I crank it then it goes up and down no matter the rpm,and voltage at the battery is fine.
PLEASE HELP IM STUMPED.

The motor doesnt try to die when the voltage goes low but it bounces so fast that it might not have time to die before the voltage goes back up.Just some more info....