REAR MARKER LIGHT(S) DO NOT OPERATE. (Cont) -725550179

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) Remove four locknuts and rear

junction box guard. Discard

locknuts.

(2) Loosen four captive screws and

remove rear junction box.

(3) Set multimeter select switch to

volts dc.

(4) Connect positive (+) multimeter lead

to rear junction box, terminal 31.

(5) Connect negative (--) multimeter lead

to a known good ground.

(6) While assistant turns ON ENGINE

switch and turns on lights, observe

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

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

replace rear junction box

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

wire 1012-31 (see schematic,

Fig FO-1) or replace rear marker

(7) Turn off lights and turn OFF ENGINE

switch.

CONTINUITY TEST

(1) Set multimeter select switch to ohms.

(2) Is there continuity between rear

junction box terminal 34 and a known

good ground?

(a) If there is no continuity,

replace rear junction box

(b) If there is continuity, repair

wire 1435-34 (see schematic,

Fig FO-1) or replace rear marker

(3) Install junction box cover and tighten

four captive screws.

(4) Install rear junction box guard and

four locknuts.