I am wanting to use a whale submersible pump with a portable water carrier to fill my onboard water tank for those occasions when I am not near a convenient water tap. I am struggling to wire up the 12volt cigarette type plug. It is not like a 13 amp type plug and after preparing the necessary live/neutral wires I think that I will have to solder them to the blades inside the plug as there are no screws etc to attach them to. I do not think that crimping them to the blades will be secure enough. Help please.