As a hiring manager that reviews hundreds of resumes each year, I can say from experience that a hiring manager has at most 2 to 3 minutes to review your resume. Chances are they are going to scan it at a high level and look for key bits of information that will cause them to probe further.
Your resume should not be written like an essay, but should provide a few key phrases and facts about your past experience that will intrigue the hiring manager to want to know more - likely by asking you in an interview.
If your past experience does not relate in any way to the role to which you are applying, consider including the role in the history to show continued employment, but limit the degree to which you speak about that role.
Also, a concise cover letter talking about why this position is the right one for you, tailored to that specific position, lets the hiring manager know that you are serious about this role, and that you are not simply casting a wide net with your search/resume in order to see who is biting.