I will let you in on a secret, as a recruiter for over 15 years, I have never read a cover letter unless it was part of the application process.

Why?

1. The majority of recruiters (including me) will not have the time or inclination to read a cover letter that is not part of the job application. 
2. Based on my experience the majority of people who write cover letters and send them in with their resume/application, only do so because they know in their hearts that their resume or experience does not position them as a Top Candidate. So they write a cover letter in hopes it will convince you. 

However, there is another highly effective alternative to a cover letter that can 1) open doors, 2) build your network and 3) make you stand out as a Top Candidate that is resourceful, proactive and can add value to the hiring organization! (Presuming, you possess the experience required!!)

My 2.0 alternative to the old-school cover letter is the ‘Winning Email of...