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I'm not sure what you mean "at" the coil.
A vehicular ignition coil is a transformer [with two separate coils (windings) inside] that takes a 12 Volt [usually] signal pulse of electricity from the ignition points [or ignition computer if so equipped] an uses that pulse to energise its primary [low voltage]winding.
When the signal pulse current to the primary winding is turned off [upon points opening], the magnetic field in the primary winding collapses inducing a much larger current into the secondary [high voltage]. This secondary [high voltage] is then carried to the spark plug where it creates a spark at the plug's gap.
IF the 12 Volt signal pulse is getting to the ignition coil, and its primary winding inside, BUT there is no high voltage at the coil output terminal [the "tower"] then the coil is defective [usually a broken or burned through wire in the primary or secondary windings inside the coil].
IF there is NO electrical pulse getting TO the input terminal on the ignition coil, AND if it is not being turned ON and OFF then it cannot create a spark at the output terminal.
Before replacing an ignition coil or coil pack, be sure that it's getting the proper signal to allow it to work.
It is bad practice to replace components [parts] that are good!!!!!
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