Question

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

Explanation:

When using a jump pack on a negatively grounded system, safety guidelines dictate that the positive cable should be removed first. This is to prevent accidental short - circuits. Removing the positive cable first minimizes the risk of electrical arcing or sparking that could occur if the negative cable (which is often connected to the vehicle's metal frame) were to come into contact with other components before the positive connection is broken.

Answer:

Positive