Radio fuse

Hi
i own a Ford Focus sport 1.8 2007
i am trying to add a USB outlet by using a piggy back fuse wire. I connected it to the cigarette lighter fuse which drained the battery, although this didn't happen in my last car. A friend told me to connect it to the radio fuse so the USB only comes on when the car is running. But which fuse it the radio fuse? Or is there another fuse I can use so the battery won't drain?

thanks in advance
 
you can get cig.lighter usb chargers but when ignition is turned off power should be cut to fag lighter to stop it from getting power.maybe where you put the wire was on the live side and not the fused side.handbook or cover may say where fuse is.

maybe battery is old and needs replacing?
 
Back
Top