Test for power at the socket. Turn on the light switch, then ground the tester to a clean screw on the body of the car. Probe ...

Plugged into the cigarette lighter socket or clamped to the battery, this electronic wizardry turns your car’s 12 volts into mains power. The most powerful units are the size of a big paperback ...

Most modern cars offer at least two ways to charge up a smartphone, in the form of a 12V lighter socket and a ... often deliver far less power than those at home. Best car charger: 12V to USB ...