Step on the gas pedal to run the RPM up to about 3, if you want to drive more power towards the dead battery.
This will let you start your vehicle.
Never lay tools or other metal parts on top of a battery.
Instead, attach that clamp to an unpainted, metal part of the car such as a shiny, clean nut on the engine block.
When you handle the jumper cables, be aware that their function is to transmit electrical current from one car to another.
But if you turn the key and you hear the engine cranking, then your problem is most likely something else.
Logic Johnson Lafontaine.
Detach the cable from the post.
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Connect Battery Cables.