I'm installing a dual jack junction box so that I can have two connections to the phone line. When I removed the old single box and notice the red, yellow, green, and black connector wires, I also notice that the main phone line had only 3 wires that were connected to the backing plate of the old single box. Well I desided to put on the dual box and fiddle around with the connections, but the phone that's in my bedroom is not working. The house I live in is over 20 yrs, and I think that is why there are only 3 wires coming into the house and connecting to the single junction box. So how is the connection gonna work for me with 3 wires in the house to the dual juction box and to the color wires? Send all info as much as possible.