Hi there is another way you can do it, if you need to start the car to charge the battery or just to start the car to get in the boot, you can, under the bonnet there should be a connector that looks like a brass bolt, it is normally covered by a red cap with a + on it, this is the live terminal that is directly connected to the battery, if you can get someone to jump start it put the red lead on this one and put the black one anywhere there is contact with the body, then you can jump start the car, or even if it is just electric supply you need just do same ....hope this helps