Add aux lights to factory light switch on '13 - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-16-2012, 08:07 PM   #1
Join Date: Jul 2012
Posts: 17
Add aux lights to factory light switch on '13

Does anyone know how to have a set of aux lights come on when I turn on factory fogs. I read you can't splice into the factory fogs on a '12 so I assume the same on a '13.

Are there any solutions for this?

Blazer is offline   Quote Quick Reply
Old 09-16-2012, 10:36 PM   #2

WF Supporting Member
stans1stjeep's Avatar
Join Date: Dec 2011
Location: Rochester, Mi
Posts: 783
Here are a series of questions I had. This is in the lighting thread. Answer #4 may help you.

Suggestion, don't wire your driving lights in with your fogs. This will defeat the function of the fogs, and likely be illegal. In most states you can only have 4 bulbs illuminated at one time, on the road. I wired my driving lights to go on with my high beams which is both legal and useful. I also added an additional diode across the relay coil to prevent back emf. I posted later with my results.

Originally Posted by SilverSport View Post
What if you posted links to the other info threads like Hilldweller's, etc?

Stan - I will take a shot at your questions.

1) Yes. It takes 12 volts but very low amperage to energize the relay.
2) Yes. Put the switch on the signal lead from the highbeam circuit to your relay.
3) Fuse the power wire from the battery that the relay on the secondary circuit will control.
4) Pulse width modulation will destroy the relay very quickly. Here's a link to a schematic for adding a capacitor to ensure constant 12V to the relay:

5) 100w divided by 12V = 8.3 amps X 2 = 16.6amps so 20 amp should be sufficient.
6) Run dual wires from pin 87 on relay, one for each light. Run a ground wire from each light to a common ground.
7) 14 gauge is fine for signal circuit. 10 or 12 gauge for power from battery to relay to lights.
stans1stjeep is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Product

All times are GMT -5. The time now is 01:22 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC