Originally Posted by
Brian P
I’m going to replace my cigarette lighter with a USB power source today. Is it obvious what positive & negative are for the unit in the car? There’s apparently also a light in the ashtray that I believe is blown; does anyone know the part number so I can get one at my local auto parts store? I’ll do a separate search for a good replacement radio. Thanks everyone.

Brian, there is a plug-in module that (some) has 2 USB connectors in it. Many have one USB connectors but some have 2. More easily done if it is just plugged into the cig lighter socket.
.