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Battery Drains That Shut Off When Battery Cable Is Disconnected Test

WARNING: This page is about a different car, the 2003 Ford Ranger and 2002 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform battery drain test. See BATTERY DRAIN TEST . Ensure all doors are closed and accessories are off. Without starting engine, turn ignition switch to RUN position for a moment, and then turn ignition OFF. Wait a few minutes for illuminated entry lamps to turn off (if equipped).
  2. Connect ammeter between negative battery cable and negative battery post. Disconnect negative battery cable from negative battery post, without breaking the ammeter connection to prevent modules from resetting. Read amperage draw.
  3. Amperage draw should be less than 50 milliamps. If current draw exceeds 50 milliamps, remove fuses from battery/central junction box one at a time to locate problem circuit.