I was at work,my girlfriend gave a friend a boost,now the interior lights, vanity lights, cigarette lighters do not work.I checked both fuse boxes,engine compartment,the one in the trunk(I checked all fuses,did not find any blown.Can someone please guide me in the right direction thanks.

The device that was used to boost the dead car(mercedes),is called wonder charger,which runs from the cigarette lighter's.that was when she noticed the interior light's go out in the cadillac,the moment the device was put in the dead car cigarette lighter outlet.I did check all fuses they look good,but in the car manual there is a inadvert relay which half is male the other female it's located next to the fuse box in the engine compartment,Do you think this could be the problem?(everything that was blown, seem's to lead to this relay according to the manual. The device that was used to boost the dead car(mercedes),is called wonder charger,which runs from the cigarette lighter's.that was when she noticed the interior light's go out in the cadillac,the moment the device was put in the dead car cigarette lighter outlet.I did check all fuses they look good,but in the car manual there is a inadvert relay which half is male the other female it's located next to the fuse box in the engine compartment,Do you think this could be the problem?(everything that was blown, seem's to lead to this relay according to the manual.