I have a 1991 Toyota 4runner with no running lights. The highbeams work but the headlights/running lights don't work. Is it a fuse or a bigger problem?

SOURCE: my headlights only work on highbeam.

Yes there is a relay switch that allows the low to high beam switch to occur. It shoud be mounted under the hood along the firewall. Check your manual too!

Thanks,

Mark

SOURCE: My left headlight highbeam light works and the lowbeam don't why

the filament on the low beam burnt out. but the high beam didn't. You have a filament for each. 1 for high beam and 1 for low beam in the same light bulb. You need a new head light.

SOURCE: 1991 Toyota Camry, tail lights and dash lights don't work

Have you looked under the hood? There are more fuses under the hood. Is your dimmer turned down on your dash lights?

SOURCE: my 1991 toyota 4runner keeps blowing the efi fuse

Check the EFI main relay, the circuit opening relay, and the fuel pump relay. Inside the fuel pump relay there is a switch controlled by a coil. During start, the fuel pump gets full power for a couple of seconds to build up pressure. Once pressure is good, the fuel pump relay is supposed to switch (via the coil) the fuel pump to reduced power. If the coil in the relay is bad, the reduced power setting is not available and the fuel pump will run at full power all the time. At this heavy current draw, it won't be long until the EFI fuse blows. This would also give more pressure than is necessary to the cold start fuel injector which runs on a timer. This extra pressure during the time that the cold start injector is operating may be the reason the engine is flooding with fuel.

SOURCE: dash and tail lights stopped working on my

Under your clutch there is a switch. That switch might need replacing. The auto parts store calls it a breaklight switch. And no, headlights haveva relay.