The 30-year-old former Nottingham Forest left-back was a free agent after leaving Crewe Alexandra and comes into contention for a debut against Plymouth Argyle on Saturday as the Cobblers look to begin the climb away from the foot of the table.
***Update*** Wilder's reshaping of the team he inherited continued on Wednesday as Matty Blair, Sean McGinty and James Hurst have all returned to their parent clubs ahead of their loans expiring.