TAILLIGHT(S) DO NOT OPERATE (S/N YB6122 075 AND UP). (Cont) -725550453

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) Disconnect 12 vdc (7 pin) cable from

connector MC16.

(2) Set multimeter select switch to

volts dc.

(3) Connect positive (+) multimeter lead

to pin F on trailer end connector.

(4) Connect negative (- ) multimeter lead

to pin A on trailer end connector.

(5) While assistant turns ON ENGINE

switch and turns on lights, observe

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

(a) If 10 to 14 vdc are not present,

perform Steps (6) and (7) below,

(b) If 10 to 14 vdc are present, 12 vdc

cable is OK.

(6) Turn off lights.

(7) Turn OFF ENGINE switch.

(8) Connect 12 vdc cable to connector

MC16.

VOLTAGE TEST

(1) Disconnect diode assembly from diode

assembly connector.

(2) Connect positive (+) multimeter lead

to diode assembly connector, terminal 8.

(3) Connect negative (- ) multimeter lead

to a known good ground.

(4) While assistant turns ON ENGINE

switch and turns on lights, observe

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

(a) If 10 to 14 vdc are not present,

perform Steps (5) and (6) below,

and repair wire 1008-1 (see

schematic, Fig FO-1.1) or replace

trailer main wire harness

(b) If 10 to 14 vdc are present,

wire 1008-1 is OK.

(5) Turn off lights.

(6) Turn OFF ENGINE switch.