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Old 12-01-2011, 11:35 AM   #1
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Install Rallylights Harness in 2012

Going to install Rallylights Plug & Play Harness in 2012 JKU Rubicon. Anyone who did this, where did you mount the relays? Not much room inside the engine compartment.

I have the Delta Quad-Bar Xenon Headlamp kit, with DLR using LED's. Am happy with the lights so far, but the wiring harness should improve the light output. I would have used the complete Rallylight Jeep Wrangler kit except it does not have DLR compatibility.

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Old 12-01-2011, 10:50 PM   #2
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With RallyLights Plug & Play Harness installed, the lights are as bright as they should have been in the first place. Mounted relays on scrap piece of metal, them attached to plastic beside battery with self taping screws. Ran wire from relays to front lights. Now have good headlight and DLR LED's. If someone comes up with a better way to mount the relays I can always copy.

I will keep the adapters from the Delta Quad-Bar Xenon Headlight kit with me, so if the wiring harness or relays ever fail I can bypass it and use original Jeep wiring for temporary repair.
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Old 12-22-2011, 10:20 AM   #3
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Great looking setup. So after a few weeks, are you still digging it? How are oncoming drivers on low-beam responding? Thanks.
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Old 12-22-2011, 11:22 AM   #4
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Great looking setup. So after a few weeks, are you still digging it? How are oncoming drivers on low-beam responding? Thanks.
Working great, changed out bulbs to Philips Xtream Power+80, big improvement, now have good lights. No trouble with oncoming drivers, have not had to adjust lights.
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Old 12-22-2011, 01:08 PM   #5
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Can you go into a little more detail on the harness? How exactly does it hook up to the factory harness or does it bypass everything entirely forcing you to use an independent switch? I want to retain the "Auto" light feature on my Rubicon but of course would like to upgrade the lights and wiring.
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Old 12-22-2011, 02:48 PM   #6
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Can you go into a little more detail on the harness? How exactly does it hook up to the factory harness or does it bypass everything entirely forcing you to use an independent switch? I want to retain the "Auto" light feature on my Rubicon but of course would like to upgrade the lights and wiring.
1. Black wire, goes to negative side of battery.

2. Red wire, goes to positive side of battery. Has inline 30 amp fuse.

3. Gray wire, plugs into the H13 passenger side light connection you remove from that head lite. This wire controls the relays to operate the headlights. Headlights will work same way they did be for you make the change.

4. Gray wire plugs into the passenger side new H4 head lite. (shorter one)

5. Gray wire plugs into the drivers side of new H4 head lite. (longer one)

I carry the H13 adapters to convert to H4 with me. If the new wiring harness or new relays fail, you can bypass them to work old way with H4 headlights. No wires cut, can be put back to stock at anytime.
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Old 12-22-2011, 03:55 PM   #7
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Got it, but here is my question. This new harness really isn't dealing with the weak wiring. I have used adapters that plug into the harness at the light level, but the new lights draw more power then stock and overheat the weak wiring going back to the dash switch and for me in my other car, actually melted the wiring. I don't want to face that same thing with the jeep, especially after reading several posts that the Jeep's electrical system is very sensitive.

The only difference I can see in this case is that the power and ground are going directly to the battery and have fuses and relays inline. The only thing going back to the factory switch is the trigger or "remote" wire which just is the messenger to turn on/off. Am I correct?
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Old 12-22-2011, 04:38 PM   #8
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Got it, but here is my question. This new harness really isn't dealing with the weak wiring. I have used adapters that plug into the harness at the light level, but the new lights draw more power then stock and overheat the weak wiring going back to the dash switch and for me in my other car, actually melted the wiring. I don't want to face that same thing with the jeep, especially after reading several posts that the Jeep's electrical system is very sensitive.

The only difference I can see in this case is that the power and ground are going directly to the battery and have fuses and relays inline. The only thing going back to the factory switch is the trigger or "remote" wire which just is the messenger to turn on/off. Am I correct?
You are correct. The only thing the factory wiring is operating is the relays to turn the headlights on. The RallyLights harness is plug and play. The only connection to the jeep lights is the connection to the passenger side headlight H13 connector. The new lights will be H4 with heavy gage wiring. You can get the Jeep Wrangler (2007-2012) kit from RallyLights. Order the Philips X-treme Power +80 online and save the H4 for spare that come with the kit. I used the Delta Quad 4 kit because I wanted the DLR that it has, so I just bought the RallyLights harness to go with it.
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Old 12-22-2011, 04:47 PM   #9
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Paging Hilldweller?
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Old 03-29-2012, 02:02 PM   #10
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I'm no electrician, but I think that is the point of a relay. The higher voltage lines are the ones going to the bulbs themselves, and the relay uses the lower voltage original lines just as a "trigger". The dash switch sees just what it has always seen.
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Old 03-29-2012, 08:04 PM   #11
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There are also 2 capacitors and 2 diodes installed near or at the relays to keep the voltage steady at 12v keeping the relays latched and to prevent the relay coils from back feeding power to the jk's can bus system.
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Old 03-29-2012, 09:38 PM   #12
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I want to retain the "Auto" light feature on my Rubicon but of course would like to upgrade the lights and wiring.
The harness is described well above. The auto function works just like stock, as does all the stock switches for high/low/fogs etc. Anytime voltage was/is sent down the stock wiring to illuminate the headlights it triggers the relays in the harness and clean power runs through the harness directly from the battery through lower gauge wiring to the H4 plugs at the end of the harness.

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