To find the cause of an electrical issue, you'll need to be more specific. What isn't working? Knowing the system (e.g., headlights, power windows, radio) that's experiencing a problem will allow for pinpointing the relevant fuse(s) and possibly relay(s). These are typically located in the underhood fuse box and the interior fuse panel (often under the dashboard). Consult your owner's manual for diagrams showing fuse and relay locations and functions.