These little buggers are for taillight wiring only. You can use them to marry the bare ends of your Beacon's taillight wires to their female counterparts that come with SON/Schmidt taillights. Here's a guide on how to wire up a Beacon with any SON taillight using these do-dads. You'll need wire strippers, crimpers, and a heat gun or a lighter. SONtoBeaconWiringGuide. Also get these if you need to replace or re-do the wiring on any B&M or Spanninga taillight.