Tsuter gave you one option. Personally I prefer to add the extra wire at the end. Remove each wire from the connector, cut it at the pin or socket, whichever is appropriate, solder the extra piece onto the end with shrink wrap over it, install a new pin or socket (get from the dealer) and re-insert into the connector. If the solder job is done neatly, there is hardly any extra bulge at all where the joint is. I just think it makes a better installation but that's my opinion.