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freeze until the ambient temperature gets below -54°C (-65°F). However, a battery with a low Battery Protection During Vehicle Storage Certain devices on the vehicle maintain a small continuous current drain on the battery. A battery In order to maintain a battery state of charge while storing the vehicle for more than 30 days, When the battery cannot be disconnected: 1. Maintain a high state of charge. 2. Establish a regular schedule for recharging the battery every 20-45 days. A battery that has remained in a discharged state for a long period of time is difficult to recharge CHARGING SYSTEM TEST Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description Generator The generator is a serviceable component. If there is a diagnosed failure of the generator it must
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
generator has field control circuit failure, the generator defaults to an output voltage of 13.8 Auxiliary Battery (TP2) The auxiliary battery provision (TP2) can be used to supply electrical power to additional Reference Information Schematic Reference: Starting and Charging Schematics Auxiliary Battery Schematics Connector End View Reference: Component Connector End Views Description and Operation Charging System Description and Operation Battery Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Verification
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Ignition ON. Verify that no generator or battery current sensor DTCs are set that would cause a charging system concern. If DTCs are set, go to Diagnostic Trouble Code (DTC) List - Vehicle . 2. Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 volts or greater at room temperature. If not within the specified value, charge and test the battery before testing the charging 3. Go to Circuit/System Testing. Circuit/System Testing Generator 1. Verify that the battery cable terminals are clean and tight. 2. Connect a carbon pile tester to the battery. 3. Start the engine and increase the engine speed to 2,500 RPM. Place the vehicle in tow/haul mode. Observe the voltage reading on the tester. The voltage should read between 12.6 - If not within specified range, replace the generator. 4. Adjust the carbon pile tester to the specified load test output value, refer to Generator Usage. If less than the specified value, replace the generator. 5. If equipped with an auxiliary generator, repeat this test, with the carbon pile tester's inductive pickup clamped around either generator harness. Auxiliary Battery Charging/Isolation (TP2) Perform this test if there is a concern with the charging of an auxiliary battery. Do not perform this test if the vehicle is not equipped with an auxiliary battery (TP2). 1. Disconnect the auxiliary battery. Refer to Auxiliary Battery Replacement (6.2L, and 6.6L). 2. Verify that there is not a fuse installed in the STUD 1 socket of the underhood fuse block. There may be a plastic plug installed in this position, instead of a fuse. If there is a fuse installed, remove the fuse. 3. Verify that the trailer harness, or other accessory, is connected to the underhood fuse block stud 1 terminal X7-1, if desired. Verify that the connection is clean and tight.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Ignition OFF. Verify that there is 0 volts present at the underhood fuse block stud 1 terminal X7-1. If there is voltage present at stud 1, test the auxiliary battery relay and the run relay for 5. Start the engine. Verify that there is greater than 12 volts present at the underhood fuse block stud 1 terminal X7-1. If less than the specified value, test the following components for an open/high SEO B1 fuse 125 A MEGA fuse Fusible link 2 Fusible link 3 Auxiliary battery relay Run relay 6. Reconnect the auxiliary battery. Component Testing Auxiliary Battery Relay and Run Relay (TP2) 1. Ignition OFF, disconnect the relay. 2. Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay. 3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay. 4. Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals If greater than specified range, replace the relay. Repair Procedures
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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