Four-Wheel Drive Indicator Lamp

Part Time
On vehicles with the optional part time four-wheel drive transfer case (Model NV231), the Part Time indicator lamp lights when the transfer case is engaged in the 4H or 4L positions. On vehicles with the optional full-time four-wheel drive transfer case (Model NV242), the Part Time indicator lamp lights when the transfer case is engaged in the 4 X 4 Part Time or 4 Lo positions.

When the ignition switch is in the On position, battery voltage is supplied to one side of the indicator lamp bulb. A normally-open, plunger-type, four-wheel drive switch threaded into the transfer case is hard wired in series between the other side of the indicator lamp bulb and ground. When the transfer case is shifted into the proper position, the plunger of the four-wheel drive switch is moved, closing the switch and providing a path to ground. This causes the Part Time indicator lamp bulb to light.

Full Time
The Full Time indicator lamp is only operational on vehicles equipped with the optional full-time four-wheel drive transfer case (Model NV242). The Full Time indicator lamp lights when the transfer case is engaged in the 4 X 4 Full Time position.

When the ignition switch is in the On position, battery voltage is supplied to one side of the indicator lamp bulb. A normally-open, plunger-type, four-wheel drive switch threaded into the transfer case is hard wired in series between the other side of the indicator lamp bulb and ground. When the transfer case is shifted into the proper position, the plunger of the four-wheel drive switch is moved, closing the switch and providing a path to ground. This causes the Full Time indicator lamp bulb to light.