Perform this test to determine if voltage regulator is operating correctly, using a 0-20 volt DC voltmeter.
Instructions
1. Connect positive (+) voltmeter lead to positive battery terminal and negative (–) voltmeter lead to negative terminal.
2. Start engine and run at fast idle until engine reaches normal operating temperature. Adjust engine speed to 1500-2000 RPM and observe voltmeter for highest reading. Reading should be between 13.9 and 14.7 volts.
3. If reading is high, check for a loose or dirty regulator ground lead connection. Be sure to disconnect battery cables before attempting to remove regulator.