(3) Bent lower leg. If bend is not readily apparent, check
to determine whether lower leg centers in collar of
(5) B e n t
Operate right leg with operating hand-
crank and left leg with wrench on shaft to determine
whether either leg binds at any point in its travel.
In locating the causes of the majority of light-
ing troubles on the semitrailer, the first steps are to deter-
mine whether the inoperative lamp is burned out and whether
is reaching the lamp from the
A tester or test lamp should
be used to isolate the source of the trouble so that corrective
measures can be taken.
b. All Lamps Do Not Light.
(1) Intervehicular cable not properly plugged into recep-
tacles on semitrailer and towing vehicle. Pull
out of receptacles and reinsert them fully into recep-
(2) Light switch on towing vehicle
Check setting of light switch.
(3) No current from towing vehicle. C h e c k c i r c u i t b r e a k e r
and wiring on towing vehicle.
(4) Short circuit in wiring. C h e c k w i r i n g f o r b a r e s p o t s
in insulation. Refer to wiring diagrams (figs. 24 and
(5) Dirty or corroded contacts in receptacle or on plug.
Inspect contacts (TM 9-1825E).
(6) Dirty or corroded contacts in semitrailer wiring. I n -
spect contacts (TM 9-1825E).
c. One or More Lamps Will Not Light
(1) B u r n e d
connection. Check cables for these conditions. Tighten,
repair or replace defective cables.
(3) Damaged light assembly. Replace or repair light as-
sembly (pars. 72-75).