TM9-2330-372-14&P
a. At the Intervehicular Cable and Wiring Harness Junction:
(1) Measure 24 Vdc + 1.5 Vdc on wire 24-484 when the towing vehicle's blackout taillights are actuated. The
voltage reading should pulse from 1 to 24 Vdc when the towing vehicle's right turn signal is actuated. Resistance to
trailer ground, with towing vehicle disconnected, should be 12.5 ohms +1.2 ohms.
(2) Measure 24 Vdc + 1.5 Vdc on wire 24-461 when the towing vehicle's brakes are applied. The voltage
reading should pulse from 0 to 24 Vdc when the towing vehicle's left turn signal is actuated. Resistance to trailer ground,
with towing vehicle disconnected, should be 1.0 ohms + 0.1 ohms.
(3) Measure 24 Vdc + 1.5 Vdc on wire 21 when the towing vehicle's service taillights are actuated. Resistance
to trailer ground should be 12.5 ohms + 1.0 ohms.
(4) Measure 24 Vdc + 1.4 Vdc on wire 23 when the towing vehicle's blackout stop lights are actuated.
Resistance to trailer ground should measure 8.5 ohms + 1.0 ohms.
(5) Measure 24 Vdc + 1.5 Vdc on wire 22-460 with the towing vehicle's brakes applied. The reading should
pulse from 0 to 24 Vdc when the towing vehicle's right turn signal is actuated. Resistance to trailer ground, with towing
vehicle disconnected, should be 1.0 ohms + 0.1 ohms.
b. At the wiring harness and taillight wiring harness junction, the voltage and resistance readings will be the same.
With connections open at both taillight harness junctions, the following readings should be measured.
(1) At left taillight harness:
Wire 24-484 - 25.0 ohms +2.5 ohms.
Wire 22-461 - 2.0 ohms + 0.2 ohms.
Wire 21-461 - 2.0 ohms + 0.2 ohms.
Wire 23 -17.0 ohms + 1.7 ohms.
(2) At right taillight harness:
Wire 24-483 - 25.0 ohms + 2.5 ohms.
Wire 22-460 - 2.0 ohms + 2.5 ohms.
Wire 21 - 25.0 ohms + 2.5 ohms.
Wire 23 - 17.0 ohms + 1.7 ohms.
a. Remove the three hex head capscrews (14), hex nuts (16) and spacers (15) holding lever assembly (13) to
drawbar.
b. Remove the snap ring (6) from cable (5) at front and rear mounting brackets.
4-15