i went j/y and found explorer with plug that had single gray/black wire installed in plug already also got plug for power and speaker connection side also. if you can not find this plug, you can use pug for power side of radio. these plugs have a red insert in center of plug that you can pull out of plug and that will release all pins in plug and you can remove each wire with pin from plug . just pick out a wire and sleeve it with tubing from radio shack .
hope this helps .these plugs if in j/y or found on back side of radio