⚠️ Safety First: Only perform these tests with the engine OFF and the battery disconnected to prevent accidental shorts.
1. The Diode Test (The Ultimate Health Check)
This test ensures current only flows one way through the regulator.
Procedure: Set your multimeter to the Diode symbol.
The Check: Place the Positive (Red) probe on the Positive output terminal and the Negative (Black) probe on each of the three Stator input pins one by one.
Healthy Reading: You should see a reading between 0.400V and 0.600V on all three pins.
The Swap: Swap the probes (Negative on Positive output). The meter should read "OL" (Open Loop) for all pins.
Diagnosis: If you get a reading both ways, or a "0.00" reading, the diode has failed and the regulator must be replaced.
2. Static Battery Voltage Test
If the regulator is failing to charge the battery:
Check: Measure battery voltage with the engine running at 5,000 RPM.
R125 Spec: It should read between 14.0V and 14.8V.
Warning: If it climbs above 15V, your regulator is "overcharging," which will cook your battery and blow your ECU.
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