Game Version number: 1.4.0.31
Modded?: No
Issue Description:

On the HMMWV, M923, and Jeep vehicle marker lights act like the front, and rear signaling lights instead of marker lights so in game; they're only on when the hazard lights are engaged instead of when the lights are on.

On those military vehicles under the different modes vehicle lights are supposed to act in the following manner:

Off:
All lights stay off at all times.
Except brake lights.

Service Drive / Service Park:
Headlights always stay on.
Inside the front, and rear turn signal modules there are three separate light bulbs on different electrical circuits. Marker lights, Signal lights, and Blackout lights. In these assemblies. The marker lights always stay on.

The four side marker lights always stay on as they're on the same circuit as the previously mentioned signal lights.

Hazard lights are operated here by the turn signal assembly, and will only flash the four turn signal lights. From an electrical perspective when you use your turn signal, or hazards you are sending a signal to a control box that sends 24v on/off pulses to the appropriate circuit.

BO Drive / BO Marker:
The small light next to the driver side turn signal stays on. It's a dim light, and faces straight down.

Inside the front, signal modules a set of blackout lights turn on, and will look like a pair of cat eyes (Slits). One set on the driver side, and one on the passenger side.

Both rear signal modules will also have a pair of cateyes as well, and a third lower light for breaking when set to BO Drive.

There is also a reference to these operations in the HMMWV TM on 2-112 & 2-113 in the publicly available manuals that I've found, but the diagrams look confusing, and doesn't fully explain how every light on the vehicle works.