TM-9-2330-334-13-P
FAMILY OF MEDIUM TACTICAL VEHICLES (FMTV) LOAD HANDLING SYSTEM TRAILER (LHST) M1147A1
TECHNICAL MANUAL; OPERATOR AND FIELD LEVEL MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
DECEMBER 2013
CHANGE 1
TM-9-2330-334-13-P - Page 59 of 1184
TM 9-2330-334-13&P
THEORY OF OPERATION – Continued
0003 00
0003 00-3
Change 1
ELECTRICAL SYSTEM
The towing vehicle electrical system supplies all electrical power to the trailer by way of a 24 VDC (12-
pin) connector at the rear of the towing vehicle.
In order for the towing vehicle to supply electrical power to the trailer lights, the main light switch of the
towing vehicle must be on.
The master power switch of the towing vehicle must be positioned to ON in order for electrical power to
be supplied to the trailer Anti-Lock Brake System (ABS) Electronic Control Unit (ECU).
The trailer electrical system is dependent on the towing vehicle electrical system.
The towing vehicle
electrical system must be operational in order for the trailer electrical system to be operational.
The
trailer lights and ABS ECU operate on 12 VDC.
All power to the trailer lights and ABS ECU is routed from a 24 VDC (12-pin) intervehicular cable to a
voltage converter box before allowing power to flow to the lights or ABS ECU.
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