every single light possible mate! sidelight/headlights, rear lights, number plate lights, every interior light including dash lights, and i had to laugh thismorning but as i was using the electric pump to pump the rear tire up, the noise from the pump was whiring to, as if it was getting more power then less power then more power and so on! the multimeter reading goes from 14-15, back down to 14 back to 15 etc etc etc