* Blown Fuse: This is the most common culprit. Check your owner's manual to locate the fuse for the power outlet (often labeled "cigarette lighter" or "accessory"). Test the fuse with a multimeter or visually inspect it for a broken filament. Replace it with a fuse of the same amperage rating.
* Loose or Corroded Wiring: The wires leading to the outlet might be loose, disconnected, or corroded. This is especially likely if the outlet has been used for high-current devices or has been exposed to moisture. You'll need to inspect the wiring connections at both the outlet and the fuse box.
* Faulty Power Outlet: The outlet itself could be defective. The internal components might have failed, preventing power from flowing. Replacing the outlet is the solution in this case.
* Wiring Harness Issue: A problem within the main wiring harness could interrupt the power supply to the outlet. This is less common but possible, and would require more extensive troubleshooting and potentially repair by a qualified mechanic.
* Ignition Switch Problem (Less Likely): Some power outlets are only active when the ignition is on. If yours is always off, even with the ignition on, a problem with the ignition switch circuitry *could* be a factor, but it's less likely than the others.
Troubleshooting Steps:
1. Check the Fuse: This is the first and easiest step.
2. Inspect the Wiring: If the fuse is good, visually inspect the wiring for damage or loose connections. You might need to remove the outlet to properly inspect the wiring.
3. Test the Outlet with a Multimeter: With the fuse in place and the ignition on, use a multimeter to check for voltage at the outlet's terminals. If no voltage is present, the problem lies upstream (fuse, wiring, or harness).
4. Replace the Outlet: If you have voltage at the terminals but the outlet still doesn't work, the outlet itself is likely faulty.
If you're not comfortable working with car electrical systems, it's best to take your Mustang to a qualified mechanic for diagnosis and repair. Improperly working with car electrical systems can be dangerous.
