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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
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. 
  1. Inspect the 12V battery for a cracked, broken, or damaged case, which may be indicated by battery acid leakage.
    • If there is any apparent damage, replace the battery.
  2. Verify the cold cranking amperage (CCA), and reserve capacity (RC) and/or amp hour (AH) rating of the battery to the original battery or original equipment (OE) specification. Refer to Battery Usage .
    • If the 12V battery does not meet or exceed specifications, replace the battery.
  3. Verify that the battery cables are clean and tight.
    • If the battery cable(s) need to be cleaned, clean as required and connect the terminals.
    • If the battery cable(s) are damaged, replace the cable(s).
  4. Install the J 42000  and follow directions supplied by the tester.
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