October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Load Test

Attach suitable tachometer and start engine. Turn on heater or A/C blower motor to high position and turn on headlights to high beam. Increase engine speed to 2000 RPM. Voltmeter should indicate a minimum of 0.5 volt increase over battery voltage. If system conforms to these readings, alternator operation is normal. If not, proceed to Undervoltage Test.