An electrical connector includes a housing, first and second sets of terminals and a spacer. The housing has a first sidewall, a second sidewall spaced apart from the first sidewall and a cavity between the first and second sidewalls. The first set of terminals is disposed in the cavity adjacent to the first sidewall. The second set of terminals is disposed in the cavity adjacent to the second sidewall. The spacer is disposed in the cavity between the first and second sets of terminals.