Where to connect the jumper cables

Volvo 850 jumper cable location

If the booster battery to be used is in another car, check that the cars are not touching to prevent premature completion of negative circuit. Note the position of the battery terminals and using jumper cables:

First connect the booster battery positive (+) terminal (1) to car battery positive (+) terminal (2).

Then connect the booster battery negative (-) terminal (3) to a stationary solid metal part on the engine at a point away from the battery (4).

Do not connect booster cable to any part of fuel system or any moving parts. Avoid touching hot manifolds.
After the engine has started, first remove the negative (-) terminal jumper cable. Then remove the positive (+) terminal jumper cable.