SHIELD AS 4262172 - Caterpillar

Illustration 5 g00931289
Terminals on the power distribution box
Verify that the power is disconnected by checking for voltage at the "+" and "-" terminals on the power distribution box. The voltage on the terminals should be zero VDC.
Illustration 6 g00931303
Fasteners for the power distribution box
Remove seven bolts and nuts. Open the power distribution box.
Inspect the inside of the power distribution box. Check for moisture and for corrosion. Verify that each electrical connection inside the power distribution box is securely connected.Expected Result:The inside of the power distribution box does not have moisture or corrosion. All of the electrical connections inside the power distribution box are securely connected.Results:
OK - The inside of the power distribution box does not have moisture or corrosion. All of the electrical connections inside the power distribution box are securely connected. Proceed to Test Step 11.
Not OK - The inside of the power distribution box has moisture or corrosion and/or there is a loose electrical connection.Repair: Perform the necessary repairs, when possible. Replace parts, if necessary.STOPTest Step 11. Check for an Open Circuit
Use a 151-6320 Wire Removal Tool to remove terminals P2-10 and P2-20.
Illustration 7 g01534813
Section view of the power distribution box (1) Coil terminals on the magnetic switches (2) Terminals on the "SM" circuit breaker
Use a multimeter to check for an open circuit between the points that are listed in Table 1:
Table 1
Points to Check for an Open Circuit    
Point     Point    
P2-20     "+" terminal on the power distribution box    
P2-10     "+" terminal on the power distribution box    
Each coil terminal (1) on each magnetic switch     "+" terminal on the power distribution box    
Each terminal (2) on the "SM" circuit breaker     "+" terminal on the power distribution box    Expected Result:All of the measurements are an open circuit.Results:
OK - All of the measurements are an open circuit. There is not a short circuit to the +Battery. Proceed to Test Step 12.
Not OK - At least one measurement is not an open circuit. There is a short circuit to the +Battery.Repair: Repair the wiring and/or the connection, when possible. Replace parts, if necessary.STOPTest Step 12. Check for a Short Circuit
Verify that the "SM" circuit breaker is in the ON position.
Use a multimeter to check for a short circuit between the points that are listed in Table 2:Note: Refer to Illustration 1, if necessary.
Table 2
Points to Check for a Short Circuit    
Point     Point    
P2-10     The connection for the "SM"circuit breaker that is connected to wire "P6B0A-RD"    
One of the connections for the "SM" circuit breaker     The other connection for the "SM" circuit breaker    
The connection for the "SM" circuit breaker that is connected to wire "P6B0B-RD"     The coil terminal of each magnetic switch that is connected to wire "C990-RD"    
The coil terminal of each magnetic switch that is connected to wire "C991-RD"     P2-20    Expected Result:All of the measurements are