5-18. BACKUP LAMPS.
a. Description (fig. 5-36). When the ratio selector is placed in either reverse speed, the air-
actuated backup switch (located on the transmission) will close and light up the backup lamps if
the ENGINE RUN switch is turned on and the blackout switch is in the normal position.
(Reference Table 5-12.)
The compressed air system must be charged
within the normal operating range in order
to shift the transmission and actuate the
Figure 5-36. Backup Lamp Circuit.