There are 2 wires to each coil.
The red wire with white strip that goes to all of the coils should have 12 V all the time that the ignition is turned on, running or not, it should not pulse when the engine is running.
The other wire (color varies by cylinder) is the wire that goes to the TCI. The TCI supplies the switched ground to the coil, This wire will be pulsing between ground and 12v with the engine running. It is not worth the effort to try to measure this wire with a volt meter, you will get all kinds of weird readings. You could check this wire with the ignition on and engine not running, it should show near 12V which would verify that you do not have an open coil. This will not tell you if the coil is good, just checks one possible form of bad.
The red/white wire that goes to the TCI is the same circuit as the red/white wire to the coils. BUT the wire goes thru the kill switch between the TCI and the coils. So if the TCI has clean 12v and the coils do not, check the kill switch.