Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Preventive Maintenance
5. After charging, turn OFF charger and disconnect charger
cables.
Dome
Warning lamp module
1141BULB
Electrical System
#37 or 73 (T1 3/4 wedge base
Bulb Replacement
Tail Lights
To replace the tail lamps, remove lens. The bulbs are all of
the bayonet type.
1. To remove the bulbs, turn bayonet counter clockwise and
pull out.
2. To install, fit the bulb in the socket, push in and turn bayonet
clockwise.
Replacement Bulbs
DESCRIPTION
Headlights
Front turn signal
Marker
Stop/tail turn
Backup
Hood marker
Roof marker
PART NO.
9007BULB
3157K LL BULB
1895BULB
1157BULB
1156BULB
4157NAK LL BULB
194BULB
Electrical and Alternator Precautions
Take the following precautions to avoid burning out alternator
diodes:
• Do not start the engine with alternator disconnected
(connections removed) from the circuit.
• Before welding, disconnect all electronic connections to
the vehicle batteries.
• Remove battery power cable and insulate it from the
vehicle. See “Welding” on page 250 for more information.
• Do not run the engine with the batteries disconnected.
• Do not disconnect the battery cables or alternator connection
cables with the engine running.
• Never turn the ignition switch to the IGN & START position
with the engine running.
• When charging the battery (installed in the vehicle) disconnect
the battery cables.
• Do not reverse the cables of the alternator, starter motor,
or battery.
Medium Duty (R05/09) Y53-6027 – 227 –