Ford Focus Owners Manual: Using booster cables
CAUTIONS:
Connect batteries with only the same nominal voltage.
Always use booster cables with insulated clamps and adequate size cable.
Do not disconnect the battery from the vehicle’s electrical system.
To connect the booster cables
Flat battery vehicle A Booster battery vehicle B Positive connection cable C Negative connection cable D
1. Position the vehicles so that they do not touch one another.
2. Switch off the engine and any electrical equipment.
3. Connect the positive (+) terminal of vehicle B with the positive (+) terminal of vehicle A (cable C).
4. Connect the negative (-) terminal of vehicle B to the ground connection of vehicle A (cable D. See Battery connection points.
CAUTIONS:
Do not connect to the negative (–) terminal of the flat battery.
Make sure that the cables are clear of any moving parts.
To start the engine
1. Run the engine of vehicle B at moderately high speed.
2. Start the engine of vehicle A.
3. Run both vehicles for a minimum of three minutes before disconnecting the cables.
CAUTION:
Do not switch on the headlamps when disconnecting the cables. The peak voltage could blow the bulbs.
Disconnect the cables in the reverse order.
Vehicle battery
...
Battery connection points
CAUTION:
Do not connect to the negative
(–) terminal of the flat battery. ...
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