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myFordFocus.com How-To Do-It-Yourself Instructions
(Based on 2000-2004 Zetec & SPI Model Focus')

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Jumping a Dead Battery

CAUTION WARNING: If the slave battery has recently been charged and is gassing, cover the vent plugs or covers with a damp cloth to reduce the risk of explosion should arcing occur when connecting the jumper cables. Failure to follow these instructions may result in personal injury.

CAUTION CAUTION: A discharged battery condition may have been caused by an electrical short circuit. If this condition exists there will be an apparently live circuit on the vehicle even when all normal circuits are switched off. This can cause arcing when the jumper cables are connected.

CAUTION CAUTION: While it is not recommended that the vehicle is jump started, it is recognized that this may occasionally be the only practical way to mobilize a vehicle. In such an instance the discharged battery must be recharged immediately after jump starting to avoid permanent damage.

CAUTION CAUTION: Always make sure that the jumper cables are adequate for the task. Heavy duty cables must be used.

CAUTION CAUTION: Always make sure that the slave battery is of the same voltage as the vehicle battery. The batteries must be connected in parallel.

CAUTION CAUTION: Always make sure that switchable electric circuits are switched off before connecting jumper cables. This reduces the risk of arcing occurring when the final connection is made.

WARNING: Make sure that the ends of the jumper cables do not touch each other or ground against the vehicle body at any time while the cables are attached to the battery. A fully charged battery, if shorted through jumper cables, can discharge at a rate well above 1000 amps causing violent arcing and very rapid heating of the jumper cables and terminals, and can even cause the battery to explode. Failure to follow these instructions may result in personal injury.

Instructions:

Propery Battery Connection

Attaching your jumper cables:

  1. Connect one end of your "red" jumper cable to the positive terminal on the Good Battery
  2. Connect the other end of your "red" jumper cable to the positive terminal on the Dead Battery
  3. Connect one end of your "black" jumper cable to the negative terminal on the Good Battery
  4. Connect the other end of your "black" jumper cable to a vehicle ground, NOT the Dead Batteries negative terminal.
    • Note: Vehicle ground should be at least 12 inches (300 mm) from the battery terminal, for example engine lifting eye.

Removing your jumper cables:

  • Before removing the jumper cables from the vehicle that had the dead battery, switch on the heater blower (high) or the heated rear window, to reduce the voltage peak when the cables are removed.
  • Always disconnect the jumper cables in the reverse order to the connecting sequence and do not short the ends of the cables.
  • Do not rely on the generator to restore a discharged battery. For a generator to recharge a battery, it would take in excess of eight hours continuous driving with no additional loads placed on the battery.
  • Always reduce the engine speed to idle before disconnecting the jumper cables.

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