Design preview. Not public yet.

AptKeys: plain how-tos for the practical parts of adult life

Try

Worth learning before you need it

How to jump-start a car

Gloves and eye protection on. Red to the dead battery's +, red to the good battery's +, black to the good battery's −, and the last black on bare metal on the dead car, away from the battery. Start the good car, wait a few minutes, then start yours.

Jumper cable clamp orderFour panels. 1: red clamp on the dead battery's positive terminal. 2: other red clamp on the good battery's positive terminal. 3: black clamp on the good battery's negative terminal. 4: last black clamp on bare, unpainted metal on the dead car, away from the battery. Remove them in reverse order.1Red to dead ++−DEAD+−GOODbare metal2Red to good ++−DEAD+−GOODbare metal3Black to good −+−DEAD+−GOODbare metal4Black to metal+−DEAD+−GOODbare metalSolid line: red cable. Dashed line: black cable. Gold: the clamp you connect in that step.
Clamp order: red, red, black, metal. Take them off in reverse.