STOPLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550297

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) Remove rear junction box cover.

(2) Connect positive (+) multimeter lead

to rear junction box, terminal wire

1003C.

(3) Connect negative (--) multimeter lead

to a known good ground.

(4) While assistant fully applies brake

pedal, observe multimeter

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

release brake pedal and

repair wire 1003C (see schematic,

Fig FO-1.1) or replace trailer main

wire harness (Para 4--30.1).

(b) If 22 to 28 vdc are present,

release brake pedal and repair

wire 1003C/22 (see schematic,

Fig FO-1.1) or replace composite

light harness (Para 4--30.1).

(6) Install rear junction box cover.