They usually come with the other half of the connector that you have to install. You use the switched wire to your new connector and the other you can extend and ground to the compressor or tape off,since they are grounding the clutch coil through the compressor looks like.
Any splicing you do needs to soldered and crimped to handle the load of the clutch and heat shrinked. All aftermarket comps come with this one wire design. The OE comp will cost you alot more and a quick check on ebay came up with this:
The OE part number is 55116188. I have never done a one wire hookup so I am giving you a best guess on how to do it. If you opt for a OE comp let me know and I'll give you the email for my mopar dude who may be able to give a better price.