2003 Hyundai Sonata Q&A
2003 Hyundai Sonata Question: Battery Warning Light
Flashing alternator light is a sign of a failing alternator. Put a voltmeter across the battery engine off, the voltage of a fully charged battery should be 12.6v with the engine running the voltage should read 14.6 volts if the alternator is OK. It is possible that you have poor connections causing a voltage drop. An oscilloscope is needed to check the charging pattern properly. Perhaps the alternator was a poor quality rebuild ,and maybe covered under a warentee. - patrick mannion
Battery won't stay charged. Tried that old trick of disconnecting one wire from the battery and car does run, however the little red warning light [battery] stays on when current is applied, i.e; l...
I've checked all connections and fuses , thought maybe the computer would have to be reset but I can still disconnect the battery cable and car goes dead , that tells me its still something with th...