Jump starting – it’s really essential to get the connections right, and to check the procedure in the vehicle handbooks
IF YOU need to jump start a vehicle, there are a few basic steps to follow:
1. Check your leads – are they fit for purpose? Are they thick enough? Are the clamps secure?
2. If available, use a jump-start pack – it’s much safer, and less likely to damage anything.
3. Connect jump leads in this order – positive clamp to charged battery, then the other positive clamp to the dead battery. Then the negative clamp to the dead battery, and finally fit the other negative clamp to the chassis of the vehicle with the charged battery, away from the battery itself. This means that any sparking at connections will be away from the batteries.
4. Be careful to connect the leads correctly – if you get this wrong, best case is that you will blow the alternator diodes (if fitted). In the worst case, the battery could explode.
5. Once connected, run the engine of the vehicle with the good battery at fast idle to initiate some charge into the dead battery – allow a couple of minutes before trying to start the dead vehicle.
6. Once you have finished – disconnect the leads carefully in the reverse order to above.