What is the optimal charging system voltage?
What is the optimal charging system voltage? Most alternators that are charging properly should produce a voltage of about 13.8 to 14.2 volts at idle with the lights and accessories off. On a hot engine on a hot day, the normal charging voltage might drop to 13.5 to 14.3 volts. How can I Test my Car Charging System? The first thing you can do for testing the charging system is to test the battery with a multimeter. It’s really easy to check the battery with the multimeter. I sometimes checked my car’s battery with a multimeter while adjusting the tester...