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CONNECTING THE DOME LIGHTS
The dome lights in the video monitor require three connections to the vehicle's wiring. There are
two common types of dome light circuits used, positive or negative switched. Positive systems supply
voltage to the interior lights to turn them on, negative switched systems apply ground to illuminate the
bulbs. To determine which system you have you must locate the wires at the dome light. On a positive
switched system, with all the doors closed and the lights out, both wires at the dome light will rest at
ground. When the light is activated, one of these wires will switch to +12 vdc. This is the vehicle's
switching wire. On a negative switched system, with all the doors closed and the lights out, both wires at
the dome light will rest at + 12vdc. When the light is activated, one of these wires will switch to ground.
This is the switching wire.
For positive systems, connect the red/white (Lamp auto) wire to the vehicle's switched wire. Then
connect the black/white (lamp on) wire to a fused constant 12 volt source and the red/black (lamp com-
mon) wire to a good ground. Positive systems are commonly found on Ford vehicles.
For negative systems, connect the red/white (Lamp auto) wire to the vehicle's switched wire.
Then connect the black/white (lamp on) wire to a good ground and the red/black (lamp common) wire to
fused constant 12 volt source. Negative systems are commonly found on General Motors and import
vehicles.
Note:
Some vehicles which incorporate transistorized control of the dome light circuit, such as the 1999
Dodge Caravan, may require that the red/white (Lamp auto) wire be connected to the door pin switch
wire, as the additional current draw of the Monitor's lights may not be supported by the output of the
vehicles body control computer.
Positive Switched Dome Lighting
Negative Switched Dome Lighting
Black/White-Lamp On
To 12 pin
Red/Black-Lamp Common
connector
Red/White-Lamp Auto
Factory Dome light
To
constant
Black/White-Lamp On
To 12 pin
Red/Black-Lamp Common
connector
Red/White-Lamp Auto
Factory Dome light
Factory Door
ajar switch or
Body
-2-
Factory Door
ajar switch or
To
constant
To
constant
To
constant
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