Question

which cable is installed first when using the jump pack on a negatively grounded system?
depends on battery size
negative
either - no difference
positive

Explanation:

When using a jump - pack on a negatively grounded system, the positive cable is installed first. This is to prevent accidental short - circuits. Connecting the positive cable first (to the positive terminal of the dead battery and then to the positive terminal of the good battery) and then the negative cable (to a grounded metal part of the vehicle with the dead battery and then to the negative terminal of the good battery) follows safety protocols.

Answer:

Positive