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Chevrolet Silverado 4500HD/5500HD/6500HD Owner Manual (GMNA-
Localizing-U.S.-12102101) - 2019 - crc - 10/2/18
Service and Maintenance
391
Caution
To prevent property damage, do
not allow batteries to become
heavily discharged and exposed
to subfreezing weather that will
cause them to freeze and become
damaged.
Your vehicle utilizes
maintenance-free batteries, which
will not require the periodic addition
of water. Wipe the tops of the
batteries clean to prevent a slow
current flow through the dirt,
resulting in a loss of charge. Be
sure the terminals are clamped
tightly and that the battery is
clamped securely in the battery box.
For best results:
.
Do not mix and match battery
models/manufacturers in the
same battery pack.
.
Do not use batteries with
differing CCA ratings in the
same battery pack.
.
Do not use batteries with more
than one year difference in the
installed age of batteries in the
same battery pack.
Battery Cables
Caution
To prevent property damage,
when working around the
terminals and battery, use extra
care to prevent shorting. A good
practice is to insulate pliers and
screwdrivers. Do not check
battery condition by shorting
(flashing) across terminals.
Battery cable terminals must be
clean and tight. Use a mixture of hot
water and common baking soda for
removing terminal corrosion and for
cleaning the top of the battery.
Brighten the contact surfaces with
steel wool, apply a light coat of
dielectric grease, and reassemble.
Be sure the terminals are clamped
tightly. See your dealer for grease
specifications.
Electrical Charging and Starting
System Test
At every Preventive Maintenance
(PM), fully charge the batteries
using an automatic float charger.
Then, have a qualified technician
perform an electrical system test,
available through your dealer, to
catch electrical system problems
before they cause further damage to
the batteries and prevent a stranded
vehicle. The test will check for
alternator amperage output, starter
current draw, and battery amperage
capacity. This type of testing will
detect weaknesses that may not yet
be apparent during normal daily
operations.
Terminal
Inspection-Cleaning-Corrosion
Protection
Periodically inspect electrical
connectors on the engine, battery,
and frame for corrosion and
tightness. Inspect exposed cables
for fraying or signs of abrasion.
Exposed terminals, such as
cranking motor, alternator, and
feed-through studs should be