I have a Mk3 Mondeo and I regularly use a USB lead to charge my phone, which I use for satnav. For a while this worked great and the phone would charge whilst the sat nav was in use. However recently the phone will charge, but when I have satnav on too, it drains the battery rather than charging or even holding the charge.
I tried different USB cables and 12v to usb connector and still have the same issue. I know it's not the phone as I tried it successfully in my wife's Skoda.
Any idea what might be the problem? Faulty fuse?