securing the wires to the switch to be removed and lift
the wires from switch.
(3) Remove the two screws (12) securing
the switch to the engine control panel and remove the
(4) Reverse steps (l)to (3) to install new
4-50. Gage Panel Switches
The power compartment dome light switch (18,
fig. 4-57) and the two vessel alarm bell cut-out switches
(16 and 17) are removed, inspected, cleaned, and
installed in the same manner as all other switches.
4-51. Alarm Bell
a. Removal and Disassembly.
(1) Disconnect the three identification
lights on the bell cover at the connector (fig. 4-56).
(2) Remove the nine machine screws (2,
fig. 4-58) and lockwashers securing the bell cover (3) to
the rear housing (1) and remove the cover.
(3) Refer to figure 4-59 1 or figure 4-59 2
and disassemble the alarm bell.
b. Assembly and Installation.
above to assemble and install the alarm bell.
4-52. Blackout and Service Stop and Taillights
(1) To remove either blackout or service
stop and taillights (11) and 15, fig. 4-60) uncouple wire
connectors (14) and tag leads for identification, then
remove capscrews (12) and lockwashers (13) to free
blackout units, or screws and nuts attaching service
units. Reverse this procedure to install.
(2) To replace lamps, loosen screws,
remove door (1, fig. 4-61) and remove defective lamp
by pressing in while turning lamp to left, to disengage
lamp base from socket, then remove lamp. Install new
lamp by reversing removal procedure above.
Procedure above is typical for both service and
(1) Position the two shock mounts (20)
b. Disassembly. Refer to figures 4-61 and 4-
and starter control (9) on the bracket (18) and secure
62 and disassemble the light.
c. Repair. Replace all damaged parts.
(2) Connect the wires to the terminals,
refer to figure 4-56.
Control Panel Switches
a. General. The gage line heater switches(16
screws (11), door (1), lens (2) and press and turn lamp
the space heater switch (15), the gasoline engine start
left to release. Reverse these steps to complete
and stop switches (11 and 13), the automatic manual
operation. To replace entire light assembly proceed as
control switch (10), the circuit breaker (4), and the
tractor-trailer switch (5) are all removed, cleaned,
b. Remove door and lens as given above.
inspected and installed in the same manner. Disconnect
Inside trailer body, at light to be replaced, disconnect
the battery ground lead (2, fig. 4-54) before working on
electrical connector by pressing two halves together
any of these switches.
while twisting them.
(1) Tag the wire leads on the switch to be
removed, refer to the wiring diagram, figure 4-56.