How do you know if the coil pack on your Ford Escort 1999 is bad?

I just replaced the spark plugs and wires on my 1999 Ford Escort SE. Everything was fine before I started working on it and now it won't start. Someone asked if the coil pack was okay. I just did a google search to see what the coil pack was and so, okay, now i know what they are. Well, how do you know if they are okay or not?How do you know if the coil pack on your Ford Escort 1999 is bad?you get a book, itll contain the correct ohm and voltage readings.my guess is youve got it crosswired, or accidently knocked loose a power wire, maybe even the coil pack wire,or the trigger system.