Amazon : Conntek 10000-BX Trailer 6 or 7 Pole Heavy 6 or 7 - pole junction box, the 7 - Pole Junction Box provides a fast, simplified way of connecting wires from the trailer cord to the trailer wiring. It is an excellent area for trouble shooting by offering a 4.3/5(98)Price: 20 7-Pole Fused Junction Box #PH3276 - easternmarine 7-Pole Fused Junction Box #PH3276. Our Price: $11. Be the first to review this product. 7-Pole fused electrical junction box with mounting hardware. Fused junction boxes help protect from malfunctioning or overloaded circuits. (Fuses not included) Brand: Phoenix USA MPN: PH3276.