LOST JEEPS :: View topic - Fog Lights With High Beams

I think you can do this much easier. Generally the way the lights cut out with high beams on is to make a switched ground. They use the power wire from the high beam as the ground wire for the fogs. I have the diagram from someone who did this mod a while back. I haven't gotten around to it but will email that mod to anyone interested.

The guy who did this was installing the fog light kits from Mopar. He said the instructions showed which wire was to be tapped in to the headlight wire. It was the switched ground. So, you just need to cut that wire and ground it directly and permanently (to the body) and you're done.

My 1993 Eagle Talon was the same way. I found the wire in the relay and just grounded it with a 4" jumper. Worked great.

I may do this when I put my ARB on.

Author:	Alan Ellis [ Mon Nov 28, 2005 10:10 am ]
Post subject:	Fog Lights With High Beams
I have a 2003 Limited with factory fog lights. At times, I wanna run my fog lights with the high beams. But as some of you know, the factory set-up doesn't allow this. I know on a Wrangler, you can bend a relay prong and run the fog lights with the high beams. I looked and could not find a fog light relay in the KJ fuse box. Question is: Is there a simple configuration or mod to run the fog lights with the high beams? Thanks. AE

Author:	Eddo [ Mon Nov 28, 2005 10:52 am ]
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I don't think you can just bend a tab on the relay. I You need to by pass the BCM and hook the switch directly up to the relay. This is the way I have figured out it works. Very similar to the set up in the WJ. The switch sends an on-off signal to the BCM (body control module.. another computer) and the BCM either energizes or de-energies the relay accordingly. You need to by-pass the BCM and allow the switch to directly energizes or de-energies the relay. It involves cutting some wires and splicing into others. Only other solution is to get some kc or hella driving lights and have them set up as your brights. That way you can have the fogs lighting up the ground right infront of the KJ; the low-beam lighting up a little further down the road,; and the driving lights doing the job of the brights are really piercing into the dark. Now for someone that is going to complain about it being illegal. Well so are all those auxiliary lights on your KJ. They are not street legal either, off-road use only. The same with this mod.

Author:	AdamIsAdam [ Tue Dec 13, 2005 7:40 pm ]
Post subject:
I think you can do this much easier. Generally the way the lights cut out with high beams on is to make a switched ground. They use the power wire from the high beam as the ground wire for the fogs. I have the diagram from someone who did this mod a while back. I haven't gotten around to it but will email that mod to anyone interested. The guy who did this was installing the fog light kits from Mopar. He said the instructions showed which wire was to be tapped in to the headlight wire. It was the switched ground. So, you just need to cut that wire and ground it directly and permanently (to the body) and you're done. My 1993 Eagle Talon was the same way. I found the wire in the relay and just grounded it with a 4" jumper. Worked great. I may do this when I put my ARB on.

Author:	Eddo [ Tue Dec 13, 2005 9:55 pm ]
Post subject:
AdamIsAdam wrote: I think you can do this much easier. Generally the way the lights cut out with high beams on is to make a switched ground. They use the power wire from the high beam as the ground wire for the fogs. I have the diagram from someone who did this mod a while back. I haven't gotten around to it but will email that mod to anyone interested. The guy who did this was installing the fog light kits from Mopar. He said the instructions showed which wire was to be tapped in to the headlight wire. It was the switched ground. So, you just need to cut that wire and ground it directly and permanently (to the body) and you're done. My 1993 Eagle Talon was the same way. I found the wire in the relay and just grounded it with a 4" jumper. Worked great. I may do this when I put my ARB on. I saw that too Adam, and took apart half of the Jeep tracing down wires and couldn't find anything. Then I took out the FSM and read up on how the fog lights work. Apparently everything is controlled via the computer. It didn't say anything about the fog relay using the brights as a ground. I even did the best job I could tracing down wires in a wiring diagram and it looks as if everything plugs directly into the BCM. Also I believe the factory Mopar fog lamps install a little bit different when you put them on after the fact, because they don't hook into the BCM. In the factory setup there is a direct wire coming out of the BCM to the fog lamp relay. I forgot which pin it was, but I remember looking it up. Finally, I ended up searching all over the web for more information and found some guy with a WJ. He basically described it in the same way and said how he by-passed the BCM. However, let me know if you find out differently or a trick we can do. I think I just might give what you said a try and run a constant ground for the fog relay and even the fogs to see if that does anything. It sounds promising. I'll let you all know if something turns out.

Author:	AdamIsAdam [ Tue Dec 13, 2005 10:08 pm ]
Post subject:
Hmm. Now you've got me a bit worried. If both wires going to the actual lights come directly from the computer module, grounding one might be a bad idea. Oh, I guess to avoid trouble you ground the wire coming from teh light but disconnect the one coming from the module. DOH. don't mind me. Wouldn't that work? what I just said (not the DOH, but grounding the light and just giving it HOT when we want)? Well, I'll look at it when I can when the bumper's off. I'll report back. Please do the same. I see your point in the wiring when done factory v. dealer. Although, that might mean this could work anyway, the grounding trick. That's probably what they're doing when the tap into the high beams. They're creating a switched ground and using the module to control the HOT only.

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Author:	Eddo [ Tue Dec 13, 2005 10:29 pm ]
Post subject:
AdamIsAdam wrote: I see your point in the wiring when done factory v. dealer. Although, that might mean this could work anyway, the grounding trick. That's probably what they're doing when the tap into the high beams. They're creating a switched ground and using the module to control the HOT only. That is exactly what I am thinking and going to give it a try this Friday.

Author:	AdamIsAdam [ Tue Dec 20, 2005 10:26 pm ]
Post subject:
well?

Author:	Eddo [ Wed Dec 21, 2005 11:32 am ]
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Haven't gotten around to it yet. I'm on vacation now, but have a week off at home when I get back so I'm sure to give it a try then.

Author:	Myke [ Sat Jan 21, 2006 5:24 pm ]
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I'm still interested in doing this, have you had a chance to mess around with it?

Author:	Eddo [ Sat Jan 21, 2006 9:29 pm ]
Post subject:
I did. I messed around with a VOM testing the relay and how the computer controls it. It completes the ground on the relay to energize it and breaks it to de-energize it. It is not using the brights as a ground or anything. I think the only way to do it is to hook up the switch to control the ground for energizing the relay, therefore by passing the computer.

Author:	Cacher123 [ Wed Sep 06, 2006 12:58 pm ]
Post subject:
Did anyone get anywhere with this mod? Wanna do it to my '3 Ren.

Author:	trac95ker [ Sun Sep 10, 2006 10:18 pm ]
Post subject:
Sounds like it's easier to disconnect the wiring and run an inline fuse and your own wires and a switch. Maybe you could trace the wires for the stock fog light switch and splice into it.

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