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Doohickie -> RE: Foglight Help!!! (7/17/2007 6:52:47 PM)
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If the Accent is like the Elantra, the main harness runs through the left fender area into the body by the front door hinge. There is a grommet that goes into the body; you can get a few wires through the grommet if you need to. It's okay to have the main power for the fog lights be on all the time, as long as the power that controls the relay is switched by the ignition. There are two independent circuits involved:
The power circuit. This goes from a fuse box to the battery to the fog lights and is controlled by the switched side of a relay.
The control circuit. This controls the coil side of the relay; when the coil gets power it turns the relay switch on and the fog light power circuit is turned on. It goes from another circuit, perhaps from inside the car, and may be powered only when the ignition is ON. It also should have a switch you can control if you want to switch the lights off or on. But if this circuit is switched by the ignition switch, it will automatically shut off the lights when you turn the car off. All the control features (when the lights are on or off) can be controlled by this circuit.
Here is a very simple diagram to illustrate what I mean:
[image]http://www.dfwhyundais.com/diy/FogLights/Images/BasicRelaySchematic.jpg[/image]
The 12V power on the left side can be on at all times, but it can't get to the fog lights unless the relay switches on. You can control when the relay switches on with the circuit on the right side. If the 12V power on that side is switched off by the ignition, it will turn off the fog lights when the car is turned off.
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