replace ellipsis on excerpt http://codex.wordpress.org/Function_Reference/the_excerpt#Make_the_.22read_more.22_link_to_the_post

the_excerpt_ellipsis.php

<?php 

function custom_excerpt_length( $length ) {
    return 120;
} add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );


function new_excerpt_more( $more ) {
	return ' <a class="read-more" href="' . get_permalink( get_the_ID() ) . '">' . __( 'Read More', 'your-text-domain' ) . '</a>';
}
add_filter( 'excerpt_more', 'new_excerpt_more' );

?>