J 38758 Parasitic Draw Test Switch Tool
Notice: Do not turn the parasitic draw test switch to the OFF position with the engine running. Damage will occur to the vehicle's electrical system.
Notice: The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Important: The switch knob (1) on the J 38758 is marked ON and OFF. When the switch knob is in the ON position, the circuit is closed and electrical current will pass through the switch. When the switch knob is in the OFF position, the circuit is open and electrical current will not pass through the switch.
• | When there is a current reading of 2 A or less, turn the J 38758 knob to the ON position. The electrical current will now pass through the switch. |
• | Then, switch the digital multimeter to the 2 A scale for a more accurate reading. |
• | Divide the reserve capacity by 4. |
• | 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 reserve capacity of 100 minutes, the current drain should not exceed 25 mA. |
Notice: The test switch must be in the ON position when removing the fuses in order to maintain continuity in the electrical system. This avoids damaging the digital multimeter due to accidental overloading, such as a door being opened to change a fuse.
Important: If it has been determined that the OnStar system is the source of parasitic load, Refer to OnStar Battery Consumption Test in Cellular Communication.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten
Tighten the bolt to 15 N·m (11 lb ft).