On the late model 2 seater Thunderbirds, the coil on plug units have a large failure problem. Most are fixed by replacement and often good units are replaced to avoid future work. My question is how do you test a COP unit? What measurements can be taken and what are the range of good data numbers? On my Mark VIII Lincoln with the 280hp motor, can I look for the same numbers or do different coils have different values?
I am looking for the true Mechanic's answer on testing rather than the drivers method of replacement or substution. Can you help?