Using a razor knife (box cutter) carefully strip back some of the outer sheath and expose more red wire, perhaps 8-10". Cut around the wire, taking care not to go too deep, and see if the sheath will pull off. If not, go a little deeper, or slit it lengthwise from your first cut to the end of the wire. You may have to cut off the other wires to match the lengths so as not to have far too much wire at the terminations - that will depend on what the physical termination points are like and how much room there is. You will lose the factory crimped ends but can still terminate them on the screws. Just be very careful not to leave a strand or two floating free where they might touch a different terminal that where they are supposed to go.