You can take crimp on style spade connectors, pull back the plastic shield, solder each individual wire to an individual spade connector. Then apply heat shrink tube around the whole spade connector and plug in each individual wire to the RR. The yellow wires can go in any location. Make sure the red and black (or green) go back in the same spot on the RR as they are currently. If the RR is still good, you're fixed for pennies plus beer for your solder capable buddy.