How many volts should your 1990 geo metro be putting out with the headlights on?

A 1990 Geo Metro should typically produce between 13.5 to 14.5 volts with the headlights on when the engine is running. This voltage range indicates that the alternator is functioning properly and charging the battery effectively. If the voltage drops significantly below this range, it may indicate an issue with the charging system or battery. Always use a multimeter to check the voltage accurately.