Just pull one fuse at a time to check them all if you don't have a chart on the fuse box cover.Some cars I've worked on have a small wire (fusible link) built into the bottom of the socket B+ terminal that burns out. I've replaced them with regular wire and got them working again. Test the B+ terminal at the base of the socket to see if you have power after checking the fuses. The fuses for your sockets should all be inside the vehicle, not under the hood.