* Fuse/Relay Issue (Most Likely): While seemingly unlikely that *only* hazard and brake lights would be functional, it's possible a fuse or relay related to the rest of the lights has failed. The hazard and brake light circuits might share a different fuse or relay, or have a slightly different routing that bypasses the problem. Check your owner's manual for the fuse box diagram and check all fuses related to the lighting system, including those for headlights, taillights, and turn signals. Pay special attention to any that are partially blown (showing a break in the wire within the fuse). Also, look for any relays that might control lighting circuits.
* Wiring Problem (Likely): A short or break in the main power wiring feeding the other lights is a strong possibility. This could be anywhere from the battery to the lights themselves. The hazard and brake lights might be on a separate, or more robust, branch of the wiring harness that hasn't been affected. This requires tracing wires, which is more involved.
* Multi-Function Switch (Less Likely): While less likely given the situation, a failing multi-function switch (the stalk that controls your turn signals, wipers, etc.) *could* affect some lighting functions while leaving others working, but it's less common for it to only leave hazard and brake lights intact.
* Grounding Issue (Possible): A poor ground connection could cause lights to fail. Check the ground wires connected to the lighting system. A poor ground could affect multiple circuits unevenly.
Troubleshooting Steps:
1. Check the fuses: This is the easiest and most important first step. Replace any blown fuses with the correct amperage.
2. Check the relays: If you have a relay for lighting, test it or replace it as a precaution.
3. Inspect wiring: Carefully examine the wiring harness for any signs of damage, chafing, or corrosion, particularly in areas that are subject to movement or vibration. This can be difficult without a wiring diagram.
4. Test the bulbs: Even though you suspect a wiring issue, make sure all the other bulbs are not simply burnt out.
5. Consult a wiring diagram: An accurate wiring diagram for your 1996 Ford Bronco is crucial for tracing the circuits if the fuse and relay checks don't reveal the problem. You can often find these online through automotive forums or repair manuals.
6. Seek professional help: If you're not comfortable working with car electrical systems, it's best to take your Bronco to a qualified mechanic. Diagnosing electrical problems can be challenging.
The fact that *only* the hazard and brake lights work points towards a localized issue in the main power distribution or grounding of the lighting system, rather than a problem with the lights themselves. Start with the fuses and then systematically work your way through the other possibilities.
