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DOME LIGHT CONNECTION
IMPORTANT NOTE - NEGATIVE & POSITIVE DOOR CIRCUITS:
The 4-wire harness for the LSMD121's built-in dome lights is color-coded for use in vehicles that
employ a negative door circuit. This includes GM (excepting 2003 and later full-sized SUV's),
Chrysler and most imported vehicles.
Most Ford Motor Company vehicles and 2003 and later GM full-sized SUV's employ a positive door
circuit.
First verify which type of circuit is used in the installation vehicle and then follow the instructions in the
appropriate section below.
(1) NEGATIVE Door Circuit
Red wire
- Connect to 12V constant (unswitched) power.
Yellow wire - Connect to 12V constant (unswitched) power.
Black wire - Connect to chassis ground.
White wire - Connect to negative door switch.
(2) POSITIVE Door Circuit
Red wire
- Connect to 12V constant (unswitched) power.
If there is no constant power wire under the factory dome light, a constant power lead will
have to be run to a source of unswitched 12V power.
Yellow wire - Connect to positive door switch.
Black wire - Connect to chassis ground.
White wire - Connect to chassis ground.
Positive Door Switch Vehicles
Negative Door Switch Vehicles
15
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