BLACKOUT STOPLIGHT(S) DO NOT OPERATE. (Cont) -725550229

TM 9-2330-385-14

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical

circuits, a direct short may result. Damage to equipment, injury, or death to personnel may occur.

VOLTAGE TEST

(1) Loosen six captive screws and

remove composite light cover, and

preformed packing. Discard

preformed packing.

(2) Remove blackout stoplight lamp

(3) Set multimeter select switch to

volts dc.

(4) Connect positive (+) multimeter lead

to center contact of socket.

(5) Connect negative (--) multimeter lead

to a known good ground.

(6) Turn on BLACKOUT LIGHTS selector

switch (TM 9-2320-364-10).

(7) While assistant fully applies brake

pedal, observe multimeter.

(a) If 22 to 28 vdc are not present,

perform Steps (8) and (9)

below and go to Step 4 of

this Fault.

(b) If 22 to 28 vdc are present,

perform Steps (8) and (9)

and go to Step 3 of this Fault.

(8) Release brake pedal.

(9) Turn off BLACKOUT LIGHTS selector

switch.

CONTINUITY TEST

(1) Set multimeter select switch to ohms.

(2) Is there continuity between blackout

stoplight socket ground and a known

good ground?

(a) If there is no continuity,

replace rear composite light

(b) If there is continuity, replace

blackout stoplight lamp

(3) Install blackout stoplight lamp

(4) Install preformed packing and

composite light cover, and tighten six

captive screws.