Kenworth Y53-1024 Operator's Manual page 11

Electric Power System
The Main Batteries are located behind the sleeper, on the driver's side.
They power all electrical systems on the vehicle EXCEPT the starter mo-
tor.
The Starter Batteries are located below the cab, on the driver's side, where
the vehicle's batteries have traditionally been located. They power the
starter motor.
NOTE: The starter relay and other engine controls
rely on the Main Batteries for power; therefore, the
Starter Batteries can be fully charged and the Start-
er Motor will not crank if the Main Batteries are not
charged. Do not jump start the Starter Batteries with-
out checking the Main Battery voltage first.
A DC/DC charger, also located below the cab on the driver's side, serves to
isolate the starting batteries from the main batteries and provides charge to
the starting batteries to maintain them at a minimum of 12-Volt.
NOTE: The DC/DC charger will only be activated
when either the truck is running or the truck is at-
tached to a 120-Volt AC electrical supply and the key
is in the IGN position.
Kenworth
1. Check battery voltmeter gauge on dash to ensure main battery voltage
is at least 9.5-Volt.
2. If not, plug into 120-Volt AC electrical supply to charge main batteries or
attach battery charger to charging terminals located in back of sleeper.
3. Once main battery voltage is at least 9.5-Volt, attempt to start the truck.
If truck does not start, ensure that starter battery voltage is at least 12-Volt
(check at starter using voltmeter.)
4. If not, charge the starter batteries with an external battery charger.
5. Once starter battery voltage is at least 12-Volt, attempt to start the truck.
If truck does not start, the truck should be towed to the nearest authorized
Kenworth dealer.
Refer to the Troubleshooting Section on page 33 for more details.
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