1. Check the Obvious:
* Battery: Test the battery voltage with a multimeter. A low voltage reading indicates a dead or weak battery. Have it tested at an auto parts store to confirm its condition. Even a seemingly minor impact can damage a battery internally.
* Battery Terminals: Inspect the battery terminals for corrosion or looseness. Clean them thoroughly if necessary. A loose connection can prevent starting.
* Starter: Listen carefully when you turn the key. Do you hear a click, a whirring sound, or nothing at all? A click usually indicates a weak battery, a bad starter solenoid, or a bad starter motor. No sound might point to a blown fuse or a problem with the ignition switch.
* Fuses and Relays: Check the fuses and relays related to the ignition system and starting circuit. These are usually located in fuse boxes under the hood and inside the car. Consult your owner's manual for their locations and ratings.
* Fuel Pump: Can you hear the fuel pump prime when you turn the key to the "on" position (but before cranking)? If not, this could be a problem.
2. Consider Impact-Related Damage:
* Wiring Harnesses: The impact could have damaged wiring harnesses, especially those running near the front of the car. A visual inspection is crucial; look for any signs of fraying, breaks, or disconnections.
* Sensors: Various sensors control the starting process (crankshaft position sensor, camshaft position sensor). The impact might have knocked one or more of these out of alignment or damaged them internally. This would prevent the engine from getting the signal it needs to start.
* Ignition System: The impact could have affected components in the ignition system, such as the ignition coil or distributor (if equipped). A faulty ignition coil can prevent spark, thus preventing the engine from starting.
* Computer Modules (PCM/ECM): While less likely, a severe jolt could damage the Powertrain Control Module (PCM) or Engine Control Module (ECM). This would cause various starting and running issues.
3. Next Steps:
* Professional Diagnosis: If you're not comfortable checking these components yourself, take your Mustang to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately. Explain the accident to them.
* Owner's Manual: Consult your owner's manual for specific diagrams and troubleshooting information for your 1998 GT.
Important Note: Driving a car with potential electrical or mechanical damage is unsafe. Have the issue resolved before driving again.
