I have a horse trailer which needs the wiring and lighting replaced due to corrosion over time. I have a mechanic who has offered to help me but I have been left with the task of purchasing what I need. My trailer has old 7 pin wiring, including a junction box which I assume is what allows me to have internal lighting.
My car has a 13 pin socket so I am thinking I would like to upgrade the wiring system. What would I need to purchase to allow me to have: Rear lights - side/indicators/brake/fog/reverse and number plate as well as internal lights?
My main confusion is will I need to change the junction box? As well as wondering if there will be any wires left over that aren't used (from what I've read they talk about 240v and fridge wires)? If I have wires that are not needed will this cause a problem with the lighting working?