Hopefully someone can shed some light
on my question. I just had a brake controller installed on my scamp
and in the process had a 7 pin TV plug added to connect with the trailer. I now have trailer brakes
. Installer also wired in the hot black wire which i believe is normally used to charge the trailer battery
while in transit?? I do not have a converter/charger in the Scamp
. What purpose does the black wire serve in this instance. Any light
as to what i have going on would be appreciated.......