enblethen wrote:
Most Fords are wired for the power to be cut off when ignition switch is turned off. It goes through a 30 amp relay.
If not this type of relay wired so the control is powered by hot in run only circuit. This is a four wire where you must connect one of the small posts to ground. It also comes in a three post version with coil connected to the metal mounting bracket.
Tekonsha Battery switch
You may want to verify your rig before doing any purchasing!
I have a F250 and when the key is off no power to 7 pin connector