Momentary button and fog lamps.

I can get the DPDT relay but I know there must be a way to do it with regular relays,like the momentary to constant diagram. It says the ground can be removed with another relay but I don't know how. Remember I want to use only one momentary switch.

OK so I wrote this at the same time as the12volt wrote his so I editted it a little: "Correct me if I am wrong, but I think it is technically imposiible to make a standard 30 amp relay into a mechanically latched relay, since the mechanical latching relays use a locking clip to hold the contact in its energized position even after the coil is de-energized. Sorry if i am being too technical, but if you are interested in setting up some standard relays so that they will latch electronically, then this is quite easy actually." After looking at the links that the12volt posted, If you still need any help customizing a relay setup for your project I would be happy to help: Even if you dont need help I would like to see what I can come up with. Let me know what you need to do and I can draw you up a diagram. You will need to have a trigger that will latch the setup and then a trigger to unlatch the setup, just as you need with a mechanically latching relay.J Rilla

Owner/Installer

What I need to do is press a momentary switch to turn fog lights on and press it again to turn them off. As the12volt said the momentary to constant works but getting the lights to turn off pressing the button again is the hard part. Hope this makes sense.

I think I have something that will work, but I need to know how you have it setup right now. I need to know how your fog lights are set up, well actually ho wthey are triggered and anything else you can think of. I will start to draw this up and hopefully you will have gotten back to me so I can verify it will work firstJ Rilla

Owner/Installer

Add two more relays to the momentary to constant setup I mentioned above. On the first additional relay connect the output of the momentary switch to terminal 30, connect terminal 87a to the trigger to engage the latch, and connect terminal 87 to terminal 85 of the second additional relay. The coil of the first additonal relay needs to be energized when the latch is engaged. Connect the ground shown on the latch to terminal 87a and ground to terminal 30. Connect terminal 86 of the second additonal relay to either the output of the latched relay or to 12V+. When you first hit the momentary switch, the latch will engage. When you hit the switch a second time, the ground will be broken on the latch and disengage. If this is unclear, let me know and I'll draw a diagram sometime this evening and post it here.  the12volt • Support the12volt.com

I'll give it a go but if you could draw up a daigram that would be muchly appreciated. I have them setup where the power comes from the battery to a switch which I want to replace with the factory momentary switch (don't like the cheap one that came with them) then the accesory wire goes to the lamps and then to ground, your typical setup. I am doing this to replace the lamps with factory ones if you wondered. Hope thats enough.

Well the mechanical relay is the best route but believe me they are expensive and nearly impossible to find. I'm trying to do exactly what you are and am almost finished thanks to the12volt, I'll let you know when I'm done.

That's not going to melt my switch is it? I tried the momentary to constant setup and with the switch ground and smoke came from it, it still works (thankfully). I will give it a try though. Have to get one more relay tomorrow.