This voltage reducer allows you to run a 12 v trailer on a 24 v tow vehicle effortlessly and without structural modifications the voltage reducer is of 7pin 12 v shown with 24 v socket din iso 1724 on a 7 pin 12 v plugtowing vehicle 7pin 12 v occupied with 24 v socket din iso 1724 trailer has a 7 pin 12 v connector din iso 1724 for re import vehicles bw vehicles off road vehicles with 24 v system