Wiring Fog lights to work with stock switch - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 07-24-2009, 07:02 AM Thread Starter
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Wiring Fog lights to work with stock switch

I am trying to wire up some HIDs to work with the stock switch and the stock lights.

I know I need to run them off a relay, what wires do i need to tap into to activate the relay with the stock fog light switch?
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post #2 of 7 Old 07-24-2009, 09:05 AM
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I just bought a plug off the internet that match the H10 bulbs in the stock fogs. The stock fog wiring then powers the coil of the relay. I ran a ground lead directly to the battery and then to both lights, and ran the positive from the battery through a fuse to the relay contact, and then from the other contact to the positive lead on the lights. That way I did not have to cut or splice any of the stock wiring. I have not had any PWM issues or relay buzzing but others have. YMMV.

Bryan.

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post #3 of 7 Old 07-24-2009, 10:21 AM
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Quote:
Originally Posted by Helajames View Post
I am trying to wire up some HIDs to work with the stock switch and the stock lights.

I know I need to run them off a relay, what wires do i need to tap into to activate the relay with the stock fog light switch?
No need for a relay, at least I didn't need one. I just tapped into the OEM wiring and haven't looked back since. There's actually just 2 wires running into the OEM fog lights which match up with the HID positive/negative. Do a search for some of my posts and you'll see the mini-write-up I did.

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post #4 of 7 Old 07-24-2009, 11:41 AM
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Yeah, it is worth trying to run your lights without the relay before going through the effort of building a relay harness. For example, the HIDX/Cragen/OReilly 7" lights did NOT work with the stock wiring, though a couple people have gotten the 4" HIDX lights (supposedly the same bulb and ballast) to work. I even tried to see if there was an inrush current issue caused by internal capacitors by warming up the lights directly off the battery, then moving them to the stock wiring. No change.

Bryan.

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post #5 of 7 Old 07-24-2009, 12:47 PM Thread Starter
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let me clarify, I want to run the stock lights as well as my axillary Vision X HID Driving lights activated by a single stock switch.


Jim
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post #6 of 7 Old 07-24-2009, 12:47 PM Thread Starter
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Quote:
Originally Posted by gt3073b View Post
I just bought a plug off the internet that match the H10 bulbs in the stock fogs. The stock fog wiring then powers the coil of the relay. I ran a ground lead directly to the battery and then to both lights, and ran the positive from the battery through a fuse to the relay contact, and then from the other contact to the positive lead on the lights. That way I did not have to cut or splice any of the stock wiring. I have not had any PWM issues or relay buzzing but others have. YMMV.

Bryan.
Were did you get this harness to tap in?

Jim
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post #7 of 7 Old 07-30-2009, 03:25 PM
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I didn't buy a harness. I made one. I did not retain the factory fogs though. My HID lights replaced the factory fogs. It doesn't really change much though. Buy an H10 male plug (looks just like the back of the bulb) and an H10 female plug. Wire them up like an extension but with 2 wires going to each terminal of one of the connectors. Use the two extra leads to connect the coil of your relay in parallel to the fog light bulb so that it closes the contacts when the factory fog light is on. Then wire the relay contacts as usual with power coming straight from the battery (with a fuse of course) to the HID lights.

There is nothing new or groundbreaking going on here. I just hate cutting or tapping into factory wiring when cheap connectors off the internet and some soldering will do.

Bryan.

2007 JK Rubicon Unlimited Rescue Green 6 Speed
Mods Shrockworks Rails & Bumpers, Currie Lift, Tom Woods 1350 driveshafts, 35" Toyo M/Ts on ProComp 7028s
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Last edited by gt3073b; 07-30-2009 at 03:31 PM. Reason: missed that you are keeping the oem fogs and hids on the same circuit
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