I had a pin break off on the plug and now only my brake lights and turn signals work. I've been trying to find a new plug I can just use the existing wires but can't find one. Do I have to replace the entire wire harness? All I can seem to find online is the plug with 4-10 ft of wire already attached. I get I can splice that into the existing wire, but I'd rather be able to use the old wire and wire it directly into the new plug.