GMC Sierra 2500 HD2022 Owner's Manual page 326

Extended Storage: Remove the black,
negative ( ) cable from the battery or use a
battery trickle charger.
Negative Battery Cable Disconnection
Warning
Before disconnecting the negative battery
cable, turn off all features, turn the
ignition off, and remove the key,
if equipped, from the vehicle. If this is
not done, you or others could be injured,
and the vehicle could be damaged.
Caution
If the battery is disconnected with the
ignition on or the vehicle in Retained
Accessory Power (RAP), the OnStar
back-up battery will be permanently
discharged and will need to be replaced.
1. Make sure the lamps, features, and
accessories are turned off.
2. Turn the ignition off and remove the
key, if equipped.
1. Loosen the negative battery cable nut (1).
2. Remove the negative battery cable
clamp (2) from the negative battery post.
3. Cover the negative battery cable clamp,
and negative battery post with a
non-conductive material to prevent any
contact with the negative battery cable.
Vehicle Care
Negative Battery Cable Reconnection
Caution
When reconnecting the battery:
Use the original nut from the vehicle
to secure the negative battery cable.
Do not use a different nut. If you
need a replacement nut, see your
dealer.
Tighten the nut with a hand tool. Do
not use an impact wrench or power
tools to tighten the nut.
The vehicle could be damaged if these
guidelines are not followed.
Caution
Do not use paints, lubricants, or corrosion
inhibitors on the nut that secures the
negative battery cable to the vehicle. This
could damage the vehicle.
1. Install the negative battery cable clamp
to the negative battery post.
2. Tighten the negative battery cable nut.
3. Turn the ignition on.
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