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Interconnected 24-volt dc system. |
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|  MIL-S-62076B(AT)
24-volt dc system shall also conform to the Federal Motor Carrier Safety Regulations referenced
in 3.4.9.2, except the 24-volt dc stop and turn lamps shall be combined.
3.4.9.4 Interconnected 24-volt dc system. When specified (see 6.2), capability of operating
the 12-volt dc system (see 3.4.9.2) from a towing vehicle equipped with a nominal 24-volt dc
electrical system shall also be provided.
3.4.9.5 Receptacle, 24-volt dc. When either an independent or interconnected 24-volt dc
system is specified, the front of the semitrailer chassis shall also be equipped with a l2-contact
receptacle and cover conforming to MS75021-1. The receptacle shall be located in accordance
with SAE J702. The 24-volt dc, 12-contact receptacle shall be connected to the lights as follows:
Contact B.
Connect to left-hand turn signal and stop lamp (yellow).
Contact D.
Connect to ground (white).
Contact E.
Connect to clearance, side marker, identification, and tail lamps
(black and brown).
Contact J.
Connect to right-hand turn signal and stop lamp (green).
Contact L.
Connect to ground (white).
The rest of the contacts shall not be connected. Circuits B and J on tactical trucks are
combination stop and turn indicator circuits. On the interconnected 24-volt system, the normal
l2-volt dc turn signal lights will function both as turn signals and stop lights, and the normal
l2-volt dc stop lights will not be operational when the semitrailer chassis is connected to a towing
vehicle with a 24-volt dc power supply. Because of this condition, the stop light (red) circuit is
not connected to the 24-volt dc, l2-contact receptacle.
3.4.9.6 Resistors. When an interconnected 24-volt dc system is specified (see 3.4.9.4), the
12-contact receptacle shall be provided with resistance in each circuit to reduce the voltage of the
tactical (military design) towing vehicle from a nominal 24 volts dc to 12 volts dc. Each circuit
resistor shall be selected to reduce the 28-volt dc regulated voltage of the tactical truck to be
compatible with the maximum rated voltage of the semitrailer chassis electrical components.
The resistor assembly shall be located in a protective housing and provided with adequate
ventilation or a beat sink to preclude overheating and any damage to resistors, wiring, or adjacent
components.
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