A vehicle blows its headlight fuse instantly the moment the headlight switch is turned on. A check with an ohmmeter shows 0 ohms between the switch output wire and the chassis ground. What does this indicate?

1. A failed high-resistance headlight bulb
2. A short-circuit to ground in the wiring between the switch and the headlights
3. An open ground circuit at the headlight sockets
4. The fuse rating is too high for the circuit design