VALVE 0012028 - Caterpillar

Illustration 1 g01275957Specification
This test measures the voltage drop in the ground lead of the starter (R). The voltage drop is measured across test point (7) and test point (3).A voltage drop will cause the indicator lamp for the starter ground circuit to turn ON. The voltage drop must be larger than 1.30 0.15 volts. The lamp turned ON in order to signal a defect.A defect can only be indicated during "Test Step B, Crank".The possible causes of this condition are listed:
Disconnect switch with an excessive voltage drop
Cable connections to the frame with excessive voltage dropsNote: Disconnected switches will be tested as part of the starter ground circuit.Information for Other Circuits
There are three ways to wire a circuit for the starter ground.
Connect a single cable from the negative battery terminal directly to the negative post of the starter. Test point 1 is tied to test point 2. The analyzer does not check the voltage drop.
A disconnect switch is located in the ground cable. The switch is between the negative battery terminal and the negative starter terminal. The analyzer checks the disconnect switch. Also, the analyzer checks the cable for the switch to the starter.
The negative starter terminal is tied to the frame. The negative battery terminal is tied to the frame in a different location. This type of connection includes a disconnect switch. The analyzer checks the connections and the switch. Cleaning the connections for the cable at the frame will usually correct the defect.