How do you tell if spark plugs are firing?

[bartturner]

Trying to fix a 99 GTX RFI to get it started. Figure it is either not getting fuel or not getting spark.

It turns over but does not fire at all. How do I safely tell if the spark plugs are getting a spark? I did replace the plugs. All fuses look ok.

I really think it is a gas issue but want to eliminate a spark issue first.

Thanks in advance for the help!

 

[bartturner]

I was able to verify the spark. I did give myself a shock in the process. But definitely not the problem.