No-Load Test

1. Connect Rotunda 88 Digital Multimeter 105-R0053, or equivalent, to monitor engine speed.
2. Connect the leads of Rotunda 88 Digital Multimeter 105-R0053, or equivalent, across the battery terminals.
3. Read the voltage (base voltage).
4. Start the engine.
5. Run the engine at 1500 rpm with no electrical load.
6. Read the voltage. The voltage should be in the range of 14.1 to 14.7 volts. If the voltage increase is less than 2.5 volts above the base voltage, perform the Load Test. Load Test

If there is no voltage increase or the voltage increase is greater than 2.5 volts, service or replace the generator (GEN) .