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 TM 9-2330-394-13&P
ELECTRICAL SYSTEM THEORY OF OPERATION
TOWING VEHICLE ELECTRICAL SYSTEM
The towing vehicle electrical system supplies all electrical power to the trailer by way of a 12 vdc (7-pin)
connector or 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 Braking System (ABS) Electronic Control Unit (ECU).
0004 00-1
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