Take the black jump lead and attach it to the negative (-) terminal on the working battery. Then attach the other end to an earthing point (unpainted metal on the engine block or chassis) well away from the flat battery and fuel system.
Where should you connect the negative lead from the charger?
Connect the positive lead from the car battery charger to the positive terminal on your battery. This will likely be red with a plus sign. Connect the negative lead from the car battery charger to the negative terminal on your battery. This will likely be black with a minus sign.
Where do I put my jump leads?
One end of the red jump lead should be connected to the flat batterys positive terminal. The lead must not touch any vehicle metal. Attach the red leads other end to the boosting batterys positive terminal. Take the black lead and connect one end to the boosting batterys negative terminal.
How do you jumpstart a car without a jump lead?
Vehicles with manual transmission are easy to jumpstart without cables. The only method to start an automatic car with a dead battery is to use a portable battery charger. If you drive an automatic car, make sure you have a simple portable charger in your roadside emergency toolkit.
What happens if I connect negative first?
Negative pole first: Whole car (except a few parts like the positive pole) are connected. Any mistake with the other lead will lead to a short. If you mess up by touching the car with the other lead nothing will happen.