1993 nissan maxima relays and fuses

Start at the battery. First make sure it has a full charge. Do not proceed until you know the battery is good and fully charged. Use a voltmeter to see if charged, or take it to a parts store for testing-it is a free service, and tells if your battery is good and can hold a charge.
Next thing is to check your battery cables. Are the connections clean and tight, both at the battery and where the other end connects? Make sure no corrosion is on the terminals-that will rob power and may not let the battery charge up or put out power.
After the battery and the cables are checked, now you should get power to the fuse block, do your headlights work now?
Follow the power path-from the battery to the fuse block. Check all your fuses under the e hood, you may have a blown fuse.