Electrical System 88 UENR0623-02 d. Turn the disconnect switch to the ON position. Connect an ammeter across the disconnect switch terminals. Connect the red lead to the terminal on the frame side. Connect the black lead to the terminal on the battery. If a multimeter is used for the test use the ten amp connections to avoid damage. Note: The standard acceptable draw is 0.05 amperes. A current value above this figure usually indicates a problem. However, some large machines with multiple control modules have a higher acceptable limit. g. The current value is above 0.05 amperes. There is a current draw in the system. Go to step 7. e. Turn the disconnect switch to the OFF position.
Record the value of the electrical current. 6. Check the condition of the poly v-belt and alternator pulley. f. The current is below 0.05 amperes. The charging system is currently good. The fault is possibly an intermittent draw in the system. The batteries may be faulty. Check that no accessories were on during the test. a. If the poly v-belt is oily, clean the pulleys. Replace the poly v-belt. Refer to Disassembly and Assembly, “Alternator Belt - Remove and Install” for the correct procedure. Inspect the poly v-belt for wear or for cracks. Refer to Systems Operation, Testing and Adjusting, “V- Belt - Test”. If the poly v-belt is wet, dry the poly v-belt and the pulleys. Retest the system.
Note: The standard acceptable draw is 0.05 amperes. A current that is greater than this value usually indicates a problem. However, some large machines with multiple control modules have a higher acceptable limit. b. Inspect the nut on the alternator pulley. Ensure that the nut is not loose. If the nut is loose, tighten the nut to the correct torque. Refer to Specifications, “Alternator” for the correct torque. g. The current value is above 0.05 amperes. There is a current draw in the system. Go to step 7. 5. Turn off all accessories. Turn the keyswitch to the OFF position. c. If no faults are found from the procedures in step 6.a and step 6.b, inspect the charging system.
Refer to Systems Operation, Testing and Adjusting, “Charging System - Test” for the correct procedure. a. Connect a current probe or an ammeter to a digital multimeter. Ensure that the probe is zeroed. Clamp the current probe or an ammeter around the ground cable. Clamp the tool with the positive side away from the battery. Record the value of the electrical current. 7. Turn the keyswitch to the OFF position. b. The current value is below 2 amperes. Go to step 4.d. a. Connect a current probe or an ammeter to a digital multimeter. Ensure that the probe is zeroed. Clamp the current probe or an ammeter around the B+ cable. Clamp the tool with the positive side away from the battery.
Record the value of the electrical current. c. The current value is above 2 amperes. Go to step 7. d. Remove the ground cable from the battery terminal. For systems with four batteries or 12 V systems with two batteries, disconnect the ground cables from both negative batteries. b. The current is less than two amperes. Go to step 7.d. c. The current is more than two amperes. There is an internal problem with the alternator. Replace the alternator. Refer to Disassembly and Assembly, “Alternator - Remove and Install” for the correct procedure. e. Connect an ammeter between the disconnected battery ground cable and one of the negative battery terminals. Connect the red lead to the cable.
Connect the black lead to the terminal on the battery. If a multimeter is used for the test use the ten amp connections to avoid damage. d. Disconnect the wire for B+ terminal from the alternator. Connect the red lead of the multimeter to the wire for the B+ terminal. Connect the black lead of the multimeter to the B+ terminal on the alternator. Set the multimeter to ten amp. Record the value of the electrical current. f. The current is below 0.05 amperes. The charging system is currently good. The fault is possibly an intermittent draw in the system. The batteries may be faulty. Check that no accessories were on during the test.