* Faulty Brake Light Switch: This is a prime suspect. The brake light switch is involved in multiple circuits. A short or failure in this switch could:
* Stalling: If the switch is shorting to ground, it could disrupt the power supply to the engine's computer (PCM) or other critical components, causing a stall.
* Backup Lights On: A short could energize the backup light circuit.
* Fuel Gauge to E: The fuel gauge circuit might share a common ground or power source with the brake light switch circuit, and a problem there could affect the gauge's reading.
* Grounding Issues: A poor ground connection somewhere in the electrical system can cause erratic behavior across multiple circuits. The shared symptoms suggest a common ground point is failing, causing voltage drops and malfunctions in various systems.
* Wiring Harness Problem: Damaged or corroded wiring in the area of the brake pedal assembly, or near the fuel gauge, could cause similar problems. A short in the harness can cause erratic behavior as described.
* PCM (Powertrain Control Module) Issue: Though less likely to cause *all* three symptoms simultaneously, a failing PCM could certainly contribute to stalling. However, the fuel gauge and backup light issues point more towards a grounding or wiring problem.
What NOT to do: Don't keep driving the car. The intermittent nature of the problem makes it dangerous – the car might stall unexpectedly, especially while braking.
What to do:
1. Safety First: Have the car towed or have someone help you get it to a safe location. Do not drive it.
2. Check the Brake Light Switch: This is the easiest thing to check first. You might be able to visually inspect it for damage or corrosion. However, you'll likely need a multimeter to test its continuity and voltage.
3. Inspect Wiring: Check the wiring harness around the brake pedal and near the fuel gauge for any obvious damage, corrosion, or loose connections.
4. Professional Diagnosis: The most prudent approach is to take the car to a qualified mechanic for diagnosis and repair. They have the tools and expertise to properly diagnose the electrical issue, which could be more complex than a simple switch replacement.
Because this involves multiple systems and the potential for safety hazards, professional help is recommended. Ignoring this could lead to more serious mechanical issues or a dangerous driving situation.
