How do I check the output of my ignition coil?

 

don't know how to test output but you can test the resistance between two connections to test the health of the coil. Most shop technicians test coils the easy way, install a good used coil and see if the problem goes away.

 

With a coil tester of course.. That's no joke, but it all depends on the purpose of the test, what's the background for your needing testing..?
It can range from pulling one spark plug lead and see how far the spark will jump, to measuring resistances, and finally to using advanced test instruments to measure peak voltage [kiloVolts], peak current [milliAmps], spark duration [milliseconds], and spark energy [milliJoules]..

 

I actually already used blkbird's suggestion and just swapped it with a different coil, my friend let me "borrow" his from his GTA and it turns out that mine was bad...

 

Always nice when there's a quick & easy way to solve a problem.
I gather that your car didn't start then..

 

Nope wouldn't start, and I hadn't hada coil problem before so I just went throught the entire system, air, fuel and ignition before I found the coil. Swapped it with my friends and the car started right up, and runs fine, for now...

 

Yes, glad you solved it without getting grey hairs! There's always that first time, and nothing beats a systematic approach.. Oh yes, you can bet that somewhere down the road you'll be put to the test, again... ;D