Momentary button and fog lamps.

Disregard the above. I got the LED fixed but need to figure out how to make the relay stay on once the momentary button is pushed and then have the relay turn off when pushed again. How would this be accomplished, it's driving me nuts! Is the momentary to constant diagram what I need, if so can some one explain it to me.

Thanks.

A logic circuit sounds like overkill for what you need it for.  Do you have a switch that you just have to use, or can you use something else?  Radio Shack and many other parts suppliers have push on/ push off switches or push buttons, however not all of them have built in LED indicators.  

Another option may be a latching relay.  You can wire it so when you push the button with the parking lights on, the fog lamps will turn on.  When the parking lights are turned off, the fog lights will turn off and won't turn on again until you push the button. 

There are quite a few ways to go about it, depending on what you already have.  Don.

I found a web site that describes something similar to what you want.

Go to: http://www.tfs.net/~petek/autoelec/simple/togrel.htm

I think this is what you are looking for.

Tom

I found a place to purchase the latching relay. go to:

http://www.watsons-streetworks.com/brake_switches.html

About half way down the page is the relay.

The othe way to make the circuit above work with the automotive relays is to put two relay coils in paralell with the transistor output. this allows two relays to act as a dpdt relay.

Tom