BLACKOUT TAILLIGHT(S) DO NOT OPERATE. (Cont) -725550219

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.

CONTINUITY TEST

(1) Disconnect wire 1680/24-27 connector

at blackout taillight connector.

(2) Set multimeter select switch to ohms.

(3) Is continuity measured on center

contact of blackout taillight socket and

connector?

(a) If there is no continuity,

replace rear composite light

(Para 4-29).

(b) If there is continuity, blackout

taillight is OK.

(4) Install blackout taillight lamp by

depressing screw in center of

blackout taillight lamp and turning

clockwise.

(5) Install preformed packing and

composite light cover, and tighten six

captive screws.

VOLTAGE TEST

(1) Set multimeter select switch to

volts dc.

(2) If LED composite lights are installed,

disconnect wire 1680/24-27.

(3) Connect positive (+) multimeter lead

to wire 1680/24-27 at blackout taillight

connector.

(4) Connect negative (--) multimeter lead

to a known good ground.

(5) While assistant turns ON ENGINE

switch and turns on BLACKOUT

LIGHTS selector switch, observe

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

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

perform Steps (6) and (7) below

and repair wire 1680/24-27 (see

schematic, Fig FO-1) or replace

composite light harness

(Para 4-30).

(b) If 22 to 28 vdc are present and

composite lights are installed,

wire 1680/24-27 is OK.

LED composite lights are installed,

replace LED composite light

(Para (4-29).

(6) Turn off BLACKOUT LIGHTS selector

switch.

(7) Turn OFF ENGINE switch.

(8) Connect wire 1680/24-27 connector to

blackout taillight connector.

4-79