Car Won't Start But Lights Work

Dashboard and headlights can run on less current than the starter demands. A battery with a weak cell may light bulbs but drop below 9 V during crank. Alternatively the starter motor, solenoid, or a high-resistance cable is failing while accessories still work.

Starts then dies: charging or fuel issue after initial fire. Dim lights during crank: battery likely. Single clunk, no spin: starter or ring gear. Rapid click: low voltage — battery or connection. Security light flashing: immobilizer or key recognition.

Wiggle battery terminals while a helper cranks — if it suddenly works, clean and tighten posts. Voltage dropping below 10 V during crank on a meter confirms weak battery even if lights looked fine.

Heat-soaked starters fail intermittently. Tap-test is old-school and risky — proper diagnosis is current draw test at the shop. High-mileage cars with oil-contaminated starters on certain engines are known patterns.

Burning smell from starter cable, visible smoke, or repeated heat from starter — stop cycling the key. Tow to avoid fire risk.

Try jump from a known-good donor with engine running on donor car. If it cranks, drive to test alternator or replace battery after load test. If still no crank, suspect starter circuit.