OIL PUMP GROUP 6N4578 - Caterpillar

Illustration 1 g01285410Specification
This test measures the voltage drop across the starter relay. The voltage drop is measured across test point (9) and test point (14). Test point (9) is the positive contact and test point (14) is the negative contact.A voltage drop will cause the indicator lamp for the starting solenoid to turn ON. The voltage drop must be larger than 0.45 0.15 volts. The lamp turned ON in order to indicate a defect. A defect may be indicated during any Test Step. "Test Step B, Crank" is the most common test in order to identify a defect.The possible causes of this condition are listed:
Open solenoid contacts
Closed solenoid contacts with excessive voltage drop