1. Check the Fuses:
* Locate the fuse box: There's usually one under the hood and one inside the cabin (often under the dashboard). Consult your owner's manual for the exact locations.
* Identify the fuses related to the gauges: The manual will list which fuses control the instrument panel and gauges. Check for blown fuses (look for a broken filament). Replace any blown fuses with the correct amperage.
2. Check the Gauge Cluster:
* Loose Connections: The gauges might have loose connections within the instrument cluster itself. This often requires removing the cluster (a process best described in a repair manual specific to your year and model Jeep Cherokee). Inspect for loose or corroded connectors.
* Gauge Failure: One or both gauges may have failed internally. This often requires replacing the entire instrument cluster, which can be expensive. A used replacement from a reputable parts source might be a more cost-effective solution.
3. Check the Sending Units:
* Fuel Level Sender: Located in the fuel tank, this unit sends a signal to the gauge indicating the fuel level. A faulty sender will result in an inaccurate or non-functioning fuel gauge. This requires dropping the fuel tank, which is a significant job.
* Alternator/Voltage Sensor: The battery gauge's accuracy relies on a signal from the alternator. A failing alternator or its related voltage sensor might cause the gauge to read incorrectly or not at all. This should be tested with a multimeter. An auto parts store can perform a free alternator test.
4. Check the Wiring:
* Broken or Corroded Wires: Inspect the wiring harness leading to the instrument cluster for any broken, frayed, or corroded wires. Pay particular attention to the connections at the back of the instrument cluster and at the sending units.
Troubleshooting Steps in Order:
1. Check the fuses: This is the easiest and cheapest step first.
2. Inspect the wiring: Look for obvious damage before tackling anything more involved.
3. Test the alternator and battery: Make sure the charging system is functioning correctly.
4. Consider the gauge cluster: If the wiring and sending units check out, the cluster is the most likely culprit.
5. Check the sending units (fuel level): This is a more involved repair, best left to a mechanic unless you have experience with fuel system work.
Important Note: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic for diagnosis and repair. Incorrectly diagnosing and repairing electrical issues can lead to further damage.
