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Jump Start of Vehicle Battery

Connecting an External Battery Using Jump Leads

IF THE BATTERY YOU ARE USING TO JUMP START THE CAR 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 JUMP LEADS.

Turn off all electrical circuits such as radio, lights, indicators etc. If the reason for a flat battery is unknown the condition may be as a result of an electrical short circuit, so care must be taken during the Jump-start process and subsequent to connection to ascertain if this is the case. If this condition exists even with the electrical ancillaries turned off,this can cause arcing when the jump leads are connected, a small 'crackle' is normal but any spark or flash is an indication of a problem that should be isolated before attempting to Jump-Start the vehicle.

Rover do not recommended that the vehicle is jump started, however there are obviously occasions when this is the only practical way to mobilise the vehicle. If at all possible it is preferable to replace the flat battery with a suitable fully charged unit rather than jump-start the car.

If there is no option but to jump-start the discharged battery should be removed and recharged immediately after jump starting to avoid permanent damage.

High quality, heavy duty Jump leads must be used as the current consumption during starting is very high, and a voltage loss will be exhibited though the jump leads, increasing current requirement. Make sure that the slave battery is of the same voltage as the vehicle battery, and suitable to provide the required starting current.

warning sign MAKE SURE THAT THE ENDS OF THE JUMP LEADS DO NOT TOUCH EACH OTHER OR GROUND AGAINST THE VEHICLE BODY AT ANY TIME WHILE THE LEADS ARE ATTACHED TO THE BATTERY. ARCING AND VERY RAPID DISCHARGE CAN CAUSE THE BATTERY TO EXPLODE.

Connect the jump leads in the following sequence. Slave battery positive first then vehicle battery positive. Slave battery negative and then vehicle negative to a suitable vehicle ground point at least, 300 mm (12 in) from the battery terminal e.g. engine lifting bracket, do not connect it directly to the vehicle battery.

Do not attempt continued repeated starting of the vehicle, this will cause heat build up at the terminals and though the jump leads degrading the leads performance and adding to voltage loss. Allow 3-4 minutes recovery time for the leads and slave battery between starting attempts.

Once started reduce the engine speed to idle before disconnecting the jump leads, switch on the heater blower (high) or the heated rear screen, to reduce the alternator voltage peak when the leads are removed, as this can damage electronic equipment. Disconnect the jump leads in the reverse order to the connecting sequence taking great care not to short the ends of the leads.

Do not rely on the alternator to restore a discharged battery. Ensure that the battery is recharged or replaced with a new fully recharged unit as soon as possible.

Following Jump-starting of a completely discharged battery, carry out a Green ECM drive Cycle This will allow the power train control module to 're-learn' idle values.


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