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equipment. Anytime aftermarket accessories are installed into the courtesy lamp circuit, it Customer driving habits, such as regular short trips. This does not allow enough time to Verify that the battery and charging system are in proper working order. Refer to Battery A battery discharging for no apparent reason while the vehicle is parked can be caused by Some systems and modules such as OnStar®, and regulated voltage control (RVC), if Remote keyless entry (RKE) will wake up due to an outside input. Refer to Keyless Entry The battery run down time will vary depending on cold cranking amperage (CCA) and IMPORTANT: The battery specification listed below is a generic specification. Refer to Battery Usage when testing the Current Drain Days 25 mA 30.5 50 mA 16.5 75 mA 11 100 mA 8.25 250 mA 3.3 500 mA 1.65
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Load Test 1. Disconnect the battery negative cable from the battery negative terminal. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery 2. Install the male end of the J 38758 to the battery ground terminal. See Special Tools. 3. Turn the J 38758 knob to the OFF position. See Special Tools. 4. Install the battery negative cable to the female end of the J 38758 . See Special Tools. 5. Turn the J 38758 knob to the ON position. See Special Tools. 6. Road test the vehicle and activate ALL of the accessories, including the radio and air conditioning. This may take up to 30 minutes. 7. Park the vehicle. Turn the ignition switch to the OFF position and remove the ignition switch key. 8. Connect a 10A fused jumper wire to the test switch tool terminals. 750 mA 1 1 A 0.8 2 A 0.4 CAUTION: Refer to Battery Disconnect Caution . NOTE: Do not turn the parasitic draw test switch to the OFF position with NOTE: The test switch must be in the ON position when removing the fuses IMPORTANT: The switch knob on the J 38758 is marked ON and OFF. See Special Tools. When the switch knob is in the ON position, the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
9. Turn the J 38758 knob to the OFF position. See Special Tools. The current now flows through the jumper wire. 10. Wait 1 minute. If the fuse blows, install an inductive ammeter and go to step 19. 11. Remove the fused jumper wire. 12. Set a digital multimeter to the 10A scale. 13. Connect the digital multimeter to the test switch tool terminals. 14. Turn the J 38758 knob to the OFF position. See Special Tools. The current flows now through the digital multimeter. 15. Wait 1 minute. Check and record the current reading. 1. When there is a current reading of 2A or less, turn the J 38758 knob to the ON position. See Special Tools. The electrical current will now pass through the switch. 2. Then switch the digital multimeter down to the 2A scale for a more accurate reading when the J 38758 knob is turned OFF. See Special Tools. 16. Turn the J 38758 knob to the OFF position. See Special Tools. Wait 15 minutes for most vehicles. 17. Check and record the current reading. 18. Note the battery reserve capacity, amp hour rating. Refer to Battery Usage. 1. Divide the reserve capacity by 4, amp hour rating by 2.4. 2. Compare this to the multimeter milliampere reading taken in the previous step. The parasitic current drain should not exceed this number. Example: If a battery has a 19. If excessive current drain is not found at this time and there are no other apparent causes, complete the following: 1. Using the MIN/MAX function of the digital multimeter, monitor the parasitic drain overnight or during the day. This will determine if something has been activated during NOTE: The test switch must be in the ON position when removing IMPORTANT: Removing fuses, relays, and connectors to determine the failure area may wake up modules. You must wait for
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. When the vehicle has an unacceptable amount of parasitic current drain, remove each fuse one at a time until the current drain falls to an acceptable level. This will indicate 3. Repeat the parasitic current drain test procedure after any repair has been completed to make sure that the parasitic current drain is at an acceptable level. 4. When the cause of the excessive current drain has been located and repaired, remove the J 38758 . See Special Tools. 20. Connect the battery negative cable to the battery negative terminal. BATTERY COMMON CAUSES OF MALFUNCTION A battery is not designed to last forever. With proper care, however, the battery will provide A vehicle accessory was left on overnight. The driving speeds have been slow with frequent stops with many electrical accessories in The electrical load has exceeded the generator output, particularly with the addition of Existing conditions in the charging system, including the following possibilities: A slipping belt A bad generator The battery has not been properly maintained, including a loose battery hold down or There are mechanical conditions in the electrical system, such as a short or a pinched wire, Electrolyte Freezing The freezing point of electrolyte depends on its specific gravity. A fully charged battery will not these modules to go to sleep or use the sleep function
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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