HOSE 2676404 - Caterpillar

System Voltage
The temperature of the batteries will affect the power that is available to crank the engine. The following table is a guide to typical system voltages from a normal system.
Table 1
TYPICAL SYSTEM VOLTAGE DURING CRANKING AT VARIOUS AMBIENT TEMPERATURES    
Temperature     24V System     12V System    
-23 °C (-9.4 °F) to
-7 °C (19.4 °F)     12 to 16 V     6 to 8 V    
-23 °C (-9.4 °F) to
-7 °C (19.4 °F)     14 to 18 V     7 to 9 V    
-23 °C (-9.4 °F) to
-7 °C (19.4 °F)     16 to 20 V     8 to 10 V     The maximum amount of voltage that is lost for a starting motor is shown in table 2. The values that are listed are the maximum for machines of approximately 2000+ service meter hours. The voltage loss for newer machines is less than the voltage loss shown in the table.
Table 2
MAXIMUM ACCEPTABLE SYSTEM VOLTAGE DROPS DURING CRANKING    
Circuit     24V System     12V System    
Battery negative post to starting motor negative terminal     1.4 V     0.7 V    
Drop across disconnect switch     1.0 V     0.5 V    
Battery positive post to solenoid positive terminal     16 to 20 V     8 to 10 V    
Solenoid battery terminal to solenoid motor terminal     0.8 V     0.4 V     System voltages that are greater are often caused by loose connections, corroded connections, or switch contacts that are faulty. Procedure
Table 3
Tools Needed    
6v-7070 Digital Multimeter    
225-8266 Ammeter Tool Gp (AC/DC Clamp-On Ammeter) or equivalent    
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
If the starting motor cranks slowly or the starting motor does not crank at all, do the following procedure:
Use a multimeter in order to measure the battery voltage at the battery posts. While the engine is cranking or attempting to crank the engine, battery voltage measurements should be taken. Expected Result: The battery voltage is equal, or the battery voltage is greater than the voltage that is shown in Table 1. Results:
YES - The battery voltage is OK, proceed to 2.
NO - The battery voltage is too low, test the batteries as shown in Special Instruction, SEHS7633.Note: Low batteries can be caused by battery condition or a shorted starter.
Measure the current draw on the positive battery cable between the battery and the starting motor solenoid with the clamp-on ammeter. The maximum amount of a current draw and the minimum amount of a voltage that is allowed is provided in the Specifications section. The voltages and currents that is provided in the Specifications section are taken at a temperature of 27 °C (80.60 °F). Temperatures that are below 27 °C (80.60 °F) will require less voltage and the current draw will be higher. If the current draw is too large, the starting motor