This paper investigates the impact of fibers entering the contact interface of electrical connector terminals on their static electrical contact characteristics. The contact resistance of terminals under five different fiber diameters and three different fiber counts was tested as a function of contact pressure, and a regression model was established to analyze the effect of fibers on terminal contact resistance. The results indicate that fibers increase the contact resistance of terminals and may even lead to contact failure. The factors significantly affecting the increase in contact resistance, in order of importance, are: contact pressure (F), fiber count (N), the interaction term between fiber diameter and fiber count (DN), and the squared term of contact pressure (F2). The two factors significantly influencing contact failure are the interaction term between fiber diameter and count (DN) and the squared term of fiber count in the contact area (N2).