Will the equipment work through the liter plug? Probably. Should the equipment be plugged in the liter plug? Absolutely not. Plugging a radio in the liter plug is for people who are too lazy to correctly connect the radio to the battery, or for people who travel on business, rent cars, & need a quick way to get 13.8 volts. Years ago I was lazy, & connected my radio to the liter socket. It worked OK, but whenever I was at a red light with the headlights & A/C on, the radio did funny things as it wasn't getting enough voltage. I finally put my big boy pants on & took 20 minutes to properly connect the radio to the battery. After that I never had the red light problem again as the radio was now getting the current it needed. So unless you are in a different rental car every week, take the time to properly connect the equipment to the battery. Liter plugs are great for lighting a smoke, or charging a cellphone, but not for running 2 way equipment. I have an install guide for a Motorola 2 way radio. They do not discuss connecting the radio to the liter socket, only the battery.