PREVENTIVE MAINTENANCE ELECTRICAL SYSTEM
Regional Haul
(R05/10) Y53-6033 – 223 –
Bulb Replacement
Tail Lights
To replace the tail lamps, remove lens. The bulbs are all
of the bayonet type.
6. To remove the bulbs, turn bayonet counter clockwise
and pull out.
7. To install, fit the bulb in the socket, push in and turn
bayonet clockwise.
Replacement Bulbs
Electrical and Alternator Precautions
Take the following precautions to avoid burning out alter-
nator 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.
• 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.
• Do not polarize the alternator. The alternator should
not be polarized like a generator. To ensure correct
polarity, use a test lamp or a voltmeter.
DESCRIPTION PART NO.
Headlights 9007BULB
Front turn signal 3157K LL BULB
Marker 1895BULB
Stop/tail turn 1157BULB
Backup 1156BULB
Hood marker 4157NAK LL BULB
Roof marker 194BULB
Dome 1141BULB
Warning lamp module
#37 or 73 (T1 3/4 wedge base
