Why are there no headlights and running lights?

Normally this condition is the result of a poor body ground connection. Testing for this can be deceiving. At the static(nothing on) condition, testing can show a good ground. However when a circuit is excited, it has a determined resistance and a set current flow. If the ground connection to this or a branch circuit is loose, corroded, or broken wire. This will allow just enough connection to show as being good, but not good enough to complete the circuit with the required amount of connection when energized.

It sounds like the day running lights are coming on, not the headlights. If I'm right, the lights would come on when you put it in gear. Other models will come on at engine start. If it is the running lights, not the headlights, you can check by setting the parking brake. This turns off the running lights, but not the headlights. Verify this, and I think you will be happy to find there is nothing wrong. Good luck!

Bad headlight switch.Here's the part.

headlight switch is bad, change the headlight switch itsellf will short out, therefore blowing your fuse. turn signals and break lights are on a different relay, therefore they will still work

There is a microprocessor in the instrument cluster that grounds the DRL relay - do you know if the relay has power from the headlight fuses and is being grounded by the processor ?

SOUND LIKE FAULTY DRL HEAD LIGHT RELAY.CHECK HEAD LIGHT RELAYS YOU HAVE RELAY STAYING CLOSE NOT OPEN TO TURN OFF CONTROL CIRCUIT TO HEAD LIGHTS.

If you have daytime running lights but when you turn on your regular headlight on they do not come on. Take the bottom of your steering column off (Two Small Screws) and look at the back of your turn/dimmer switch make sure that the light blue wire is connected. The wires will break off after years of raising and lowering your steering column.

Headlights or daytime running lights?

The main switch is bad that turns on all of the lights. New a new switch.

Dash lights were falsing ? I assume you mean pulsing .
driving lights come on ? daytime running lights or park lamps ,does the vehicle have daytime running lamps . Daytime running lamps module .
Daytime Running Lamps (DRL) Module (Headlamp Auto Control Module)
Mounted behind the radio and the HVAC control, left of the instrument panel compartment.