TowDaddy (706) Maxi Fuse AutoFUSE TOWDADDY AutoFUSE, AutoFUSE eliminates having to pull a fuse while towing thereby preventing a dead battery Upon connecting to towed vehicle, the AutoFUSE automatically disconnects the manufacturers recommended fuse and provides a trickle charge Easy, one time 45 minute install LED confirms proper operation No need for manual switches which can kill engine unexpectedly while driving 32024 is a Maxi Fuse AutoFUSE