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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 +12V DC. 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 + 12V DC. When the light is
activated, one of these wires will switch to ground. This is the switching
wire.
For positive systems, connect the violet / brown (Lamp auto) wire to the
vehicle's switched wire. Then connect the red / black (lamp on) wire to
a fused constant 12 volt source and the black / red (lamp common) wire
to a good ground. Positive systems are commonly found on Ford ve-
hicles.
For negative systems, connect the violet / brown (Lamp auto) wire to
the vehicle's switched wire. Then connect the red / black (lamp on) wire
to a good ground and the black / red (lamp common) wire to fused con-
stant 12 volt source. Negative systems are commonly found on Gen-
eral 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
violet / brown (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.