Well i installed a new set of foglamps in my RS (Got a Z grille) and everything went fine except i had to make the wires longer because they couldnt reach for enough. Anyways....they look great and everything but theres one problem.....theres a switch that has a ground, a wire going to the foglamps.....then a wire that says goes to the battery.....i did that......only problem is i can turn them on and off without the key in the ignition.......which means if i accidently leave the foglights on.......it'll drain my battery. Im going to get a fog lamp switch from the chevy dealer...but i was wondering how i make my fog lamps operate via the switch....but only when the headlights are on.......ie Anytime my headlights are on...i can use the switch to turn them off or on.......anytime the lights are off (during the day or when car isnt on) they wont turn on at all. And what is a relay for? My fog lamps didnt come with a relay. I THINK instead of running the red cable directly to the battery....i have to run it to the headlight.......but where exactly do i connect it? Thanks

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http://users.ticnet.com/mult68
1992 Teal Camaro RS
T-Tops
305 TBI V8
Open air element
3" Flowmaster Exhaust System w/Quad Tips
Pretty good sound system
More to come.

 

if you have access to a multimeter, there are some wires on the brake light switch that only have power when the ignition is on and you can tap off of those if you feel like it. just make sure the wire isn't dead when you depress the pedal.

 

There are many ways to do what you want. I’ll suggest one way which I think will be the easiest and cheapest.

First, a relay has many purposes. For this circuit, we’ll want the relay (1) to switch high current using a switch rated for less than the load being switched, and (2) to isolate the load from the switch.

To wire the fog lamps to come on only if the lights are “on”, I’d:

1. Wire a relay into the hot lead of the fog lamps. Using the Normally Open (N.O.) contacts of the relay, connect one of those contacts to a 20 ampere in-line fuse. Connect the other side of the fuse to the battery positive terminal.

2. From the other N.O. relay contact (actually the common), wire it to both fog lamp positive inputs.

3. Now wire the two coil contacts on the relay. There are several ways to do this. Wire one side to a source that will have positive 12 volts when you want the fog lamps "on" (for example, wire it to the low beam +12, parking light +12 or even the ignition +12 – that will allow you to use them any time the ignition is “on”, yet turn them off whenever the ignition is turned off).

4. Wire the other side of the coil to one contact of a switch. The other contact of the switch will go to ground.

Using this circuit, you can use any switch rated to switch at least 200mA (milliamperes, or 0.2 amperes) since the relay will draw only about 130mA. This will allow you to use almost any switch.

The relay allows full battery voltage to go to the fog lamps, but more importantly, allows you to switch them “on” only when the item you connected to the positive side of the relay coil is “on”.

The fog light switch for my ’91 Camaro uses a relay too, but in a different way. Chevrolet used the relay here to switch the fog lamps “off” whenever the low beams are off, or the high beams are “on”. The fog lamp switch switches the full current to the fog lamps. The relay only allows this current to be passed when the low beams are “on” and the high beams are “off”.

Using the factory switch will probably make for a better looking installation. If you want to use this switch to switch your relay coil as described above. You would use terminals B and A.

There are two lights on this switch, one is green to indicate when the switch is “on”, the other is an indicator light in the middle of the switch that that Chevy used to indicate when the gauge lights are "on". If you want these lights to illuminate (I’m talking about the switch for a 1991 as I don't know if the different years have different wiring), wire it as follows.

1. Terminal A to the ground side of the relay to switch the fog lights on/off.

2. Terminals B and P to ground

3. Terminal C to a point that will have +12 when you want the center light on the switch to illuminate, such as one of the gauge lights.

4. Wire the positive side of the fog lamp relay coil to terminal C. This will allow fog lamp operation whenever the point you connected to terminal C is “on” (e.g. low beam +12).

Wired as above will have the green light on this rocker toggle switch illuminate green when the fog lamps are “on” and have the center indicator light “on” whenever the gauge lights are “on”.

Hope this helps

 

If you want to have the foglights on whenever you want (without headlights) you could just wire to the fuse box. Pick a fuse that doesn't work when the car is off. Then you can always have the foglights on when the car is on and the switch is on. When the car goes off, the power to the lights goes off. No need to switch the switch to off

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91 rs, convertible, K&N, Edelbrock open element cleaner, 3.73, B&M mega-shifter, goodmark cowl-induction hood