What is normal alternator output voltage?
between 13.9 and 14.8 volts
A good alternator should maintain battery voltage between 13.9 and 14.8 volts (14.2 is optimum). Even worst-case, with all accessories turned on, there should be at least 13 volts at the battery.
Is 14.7 volts too high for alternator?
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts. Above 14.5 volts charging voltage, batteries have a greatly increased tendency to release excessive acidic vapors, hydrogen gas, and to corrode things around the battery.
How do I check the current output of my alternator?
Alternator amp output test.
- Clamp the ammeter around the positive output wire on the alternator.
- Connect the carbon pile to the battery.
- Zero out the ammeter (connect as above and perform the test with the vehicle off).
- Start the vehicle and hold the engine at around 1,500 rpm.
What is a good alternator reading?
about 13.5 to 14.5 volts
A good alternator should produce about 13.5 to 14.5 volts with the engine idling. If the voltage reading is low (12.5 volts or less), it indicates a charging problem but does not tell you what’s causing it.
What component should you test first when troubleshooting a charging system issue?
Answer: Check the voltage regulator and the battery. An auto parts store may check the battery for you. Also, may sure the circuit connections for the charging system are clean and tight and check the engine body grounds.
What is normal alternator voltage output?
When testing an alternator minimum required output what is the an acceptable reading?
Ideally, the voltmeter should read less than 0.2 volts. If the alternator output circuit and ground circuits test good (voltage drop less than 0.2 volts) and the vehicle has a history of repeated alternator failures due to burned out diodes, check for a shorted indicator light terminal.