BLACKOUT TAILLIGHT(S) DO NOT OPERATE. (Cont) -725550223

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.

Resistors mounted on exterior of junction box assembly reach very high temperatures when power is

applied to circuit. Avoid touching or contacting resistors when working in or around junction boxes.

Failure to comply could result in injury to personnel.

VOLTAGE TEST

(1) Connect positive (+) multimeter lead

to front junction box, terminal 19.

(2) Connect negative (--) multimeter lead

to a known good ground.

(3) 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 (4) and (5) below

and replace front junction box

(Para 4-25).

(b) If 22 to 28 vdc are present, front

junction box is OK.

(4) Turn off BLACKOUT LIGHTS selector

switch.

(5) Turn OFF ENGINE switch.

(6) Install front junction box cover

and tighten four captive screws.

VOLTAGE TEST

(1) Remove four locknuts and rear

junction box guard. Discard

locknuts.

(2) Loosen four captive screws and

remove rear junction box.

(3) Connect positive (+) multimeter lead

to rear junction box, terminal 19.

(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 1680C-19 (see

schematic, Fig FO-1) or replace

wire harness (Para 4-30).

(b) If 22 to 28 vdc are present,

perform Steps (6) and (7) below

and replace rear junction box

(Para 4-26).

(6) Turn off BLACKOUT LIGHTS selector

switch.

(7) Turn OFF ENGINE switch.

(8) Install rear junction box guard and

four locknuts.

4-83