Chevrolet 4500 HD 2023 Manual page 301

300 Vehicle Care
4. Unlatch the latches (1) and remove the
battery cover (2) and connect the jumper
cables in the numbered sequence in the
drawing below. Make sure the cable
clamps do not touch any other metal
parts.
Make sure the cables are not on or near
pulleys, fans or other parts that will
move when the engine is started.
When it is difficult to start the engine in
a cold area, first start the engine of the
vehicle with the booster battery or
batteries and a few minutes after that
start the engine of the disabled vehicle.
5. After connecting the cables, start the
engine of the vehicle with the booster
battery.
6. Slightly rev up the engine of the vehicle
with the booster battery and start the
engine of the disabled vehicle.