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Old 04-08-2012, 08:49 AM   #1
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Reverse lights.

As Michael Coreleone said, "Just when I thought I was out, they pull me back in."

The thread about lights on the rear bumper got me to thinking. Since my bumper has mounts for lights and the Quadratec catalog shows the bumper with lights installed, I'm thinking about adding them. If I did, I would only want them for back up lights. I don't want to add another switch. I've done a little reading about splicing them in. Some said it was a bad idea unless you added a relay and others said it was no big deal. Then someone said something that caught my attention. They said that it shouldn't be a problem with additional lights on the same circuit since it was no more than adding trailer lights.

That's when it hit me. Couldn't I add a plug to the lights and connect them to my hitch plug? They would be mutually exclusive to using the trailer, but that wouldn't be an issue.

That raises the big question, which pin on the plug to I need to add the lights to in order to only use them as reverse lights?

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Old 04-08-2012, 09:00 AM   #2
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you would need the 7 way plug to get the reverse lights, here is a link to pic Trailer Wiring Diagrams | etrailer.com

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Old 04-08-2012, 09:00 AM   #3
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Does the trailer wiring have reverse? Do we have a 6 or 7 pin connector?
Wiring Steps for White Night Rear Lighting Systems Truck and SUV Reverse Lights
Edit: From a previous post it appears we have a 4pin?
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Old 04-08-2012, 09:12 AM   #4
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Good morning Dag-I don't know, there are so many times you can use rear lights---without being in reverse--

You've seen our threads on the sPOD and that would open up more systems for you SAFE,-without the computer even knowing !!

You may be out alone and need light in back for ??

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Old 04-08-2012, 09:32 AM   #5
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Old 04-08-2012, 09:45 AM   #6
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Quote:
Originally Posted by Mopar2Ya View Post
Does the trailer wiring have reverse? Do we have a 6 or 7 pin connector?
Wiring Steps for White Night Rear Lighting Systems Truck and SUV Reverse Lights
Edit: From a previous post it appears we have a 4pin?
If you have factory wiring all you have is a 4-pin. Thats enough for tail, turn, brake lights and ground.
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Old 04-08-2012, 10:01 AM   #7
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I had given this some thought, and still am. I was thinking of using a dual filiment bulb or something similar. Wiring one to a relay tripped by the reverse lights and the second run off a switch so I can use them any time I need light at the rear of the Jeep.
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Old 04-08-2012, 10:44 AM   #8
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Quote:
Originally Posted by JIMBOX View Post
Good morning Dag-I don't know, there are so many times you can use rear lights---without being in reverse--

You've seen our threads on the sPOD and that would open up more systems for you SAFE,-without the computer even knowing !!

You may be out alone and need light in back for ??

Setting up S.T.A. Missles

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Hiding a bank heist

#1/#2 in the boondocks-



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Understood, however I ONLY want them to work as reverse lights. I would prefer night vision for those other "activities."
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Old 04-08-2012, 10:51 AM   #9
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you would need the 7 way plug to get the reverse lights, here is a link to pic Trailer Wiring Diagrams | etrailer.com
That link gave me what I was (actually wasn't) looking for. It won't work with my 4 pin set up.
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Old 04-08-2012, 10:52 AM   #10
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Understood, however I ONLY want them to work as reverse lights. I would prefer night vision for those other "activities."
Course, we don't know what you actually do "on the beach" !

Which by the way was a great movie-

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Old 04-08-2012, 11:06 AM   #11
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After reading all the links you guys have provided, it would seem the only pratical way to hook up the revers lights would be to splice into the factory reverse light wires. Thanks guys. It looks like I'll be placing this one on the back burner for now.
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Old 04-08-2012, 11:13 AM   #12
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heh Heh, yeah--BARSKI and ZEISS sellsem--$500 to 2500 bucks-




Course, we don't know what you actually do "on the beach" !

Which by the way was a great movie-

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That's going to have to remain between me, my wife, and the indigenous population.



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Old 04-15-2012, 01:23 PM   #13
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OK, I didn't want to start a new thread... I'm getting ready to add a D1 to my tire carrier as a backup light, & later a backup camera. Where is the best place to run the wires through rear gate? How hard is it to remove the sub box? Any tricks/tips?
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Old 04-15-2012, 03:32 PM   #14
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Quote:
Originally Posted by JIMBOX View Post
Good morning Dag-I don't know, there are so many times you can use rear lights---without being in reverse--

You've seen our threads on the sPOD and that would open up more systems for you SAFE,-without the computer even knowing !!

You may be out alone and need light in back for ??

Setting up S.T.A. Missles

Planting Mary Jane

Hiding a bank heist

#1/#2 in the boondocks-

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I'm beginning to think you aren't as retired as you say you are.
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Old 04-15-2012, 03:56 PM   #15
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Old 12-26-2012, 02:29 PM   #16
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More on Reverse Lights

Sorry for the dust in the face guys! I hope the OP got his project done. Was looking for some similar advice so instead of adding a new thread I thought I'd ask the questions here and make this thread even mo betta!

I'm looking at adding a couple of lights on the rear of my roof rack and don't want to add any switches so I'm thinking about adding 2 relays, one triggered by reverse and the other triggered by the aux/interior lights. Can that be done? If so where would be a good place to tap into the interior lights on a 2011 JK Sahara? Thanks in advance
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Old 12-26-2012, 03:18 PM   #17
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In the mean time, this might be an option: P3457
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Old 12-26-2012, 03:25 PM   #18
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In the mean time, this might be an option: P3457
Thanks, but already ordered pro comp 5x7s 100watt lights
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Old 12-26-2012, 04:06 PM   #19
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I'm looking at adding a couple of lights on the rear of my roof rack and don't want to add any switches so I'm thinking about adding 2 relays, one triggered by reverse and the other triggered by the aux/interior lights. Can that be done? If so where would be a good place to tap into the interior lights on a 2011 JK Sahara? Thanks in advance
I think, the best place to tap into the interior lights is at the base of the roll bar next to the passenger seat.

As far as two relays, I would like to know myself.
These are the questions I have about trying to make this work.

Is it an issue powering the lights off of two separate relays?
Is it an issue powering one relay from two different sources?
Is there a relay that accepts two different trigger inputs?
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Old 12-26-2012, 04:35 PM   #20
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if you try to do that you are going to need to include a diode to protect against "back emf" from one circuit into another

Food for thought: you are in reverse &, for whatever reason, open the door or turn on the cabin light. now you have 2 electrical feeds through differing circuits interacting together at a common point. One of your relays (& possibly more things too like the computer) is going to have a bad day.

That's part of the issue if you try to tie your fogs to the highs (yes I know that fogs are not supposed to connect to highs but for the sake of arguement it can be done). There is a short time period switching between the lows/highs where there is voltage to each circuit- low fog & high fog interaction. You have to cut one of the circuits unless you are knowledgeable about electronics & can fab up a better switching system with a delay and "normally open" relay to separate grounds or something to that affect. Unless you can make the two circuits mutually exclusive, 2 source control of the same device is generally a bad idea.
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Old 12-26-2012, 05:30 PM   #21
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I am not an electrical expert by any means, but I don't see how you have two "sources" for electrical power in a vehicle unless you have an isolated battery or something. I don't see the difference, isn't it just like running two wires from the battery to the relay / load ? No harm in that, I'm probably missing something.
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Old 12-26-2012, 05:50 PM   #22
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if you try to do that you are going to need to include a diode to protect against "back emf" from one circuit into another

Food for thought: you are in reverse &, for whatever reason, open the door or turn on the cabin light. now you have 2 electrical feeds through differing circuits interacting together at a common point. One of your relays (& possibly more things too like the computer) is going to have a bad day.
Good info, no I don't want the lights to pop on whenever I hit the key fob or open a door, so I'll run the reverse signaled relay only. If I find later that I need the lights when not in reverse I'll add a switch at that time.

Thanks!
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Old 12-26-2012, 05:54 PM   #23
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I am not an electrical expert by any means, but I don't see how you have two "sources" for electrical power in a vehicle unless you have an isolated battery or something. I don't see the difference, isn't it just like running two wires from the battery to the relay / load ? No harm in that, I'm probably missing something.
Yep, I understand what you're saying 12v is 12v, but if you aren't careful you can inadvertently run 12v somewhere you didn't intend at a time that you shouldn't...
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Old 12-26-2012, 06:01 PM   #24
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I don't think it would be a problem from the battery. But I think they where going to tap into the harness somewhere to get power for the relays.
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Old 12-26-2012, 06:07 PM   #25
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I don't think it would be a problem from the battery. But I think they where going to tap into the harness somewhere to get power for the relays.
Okay, that's a different story. I alway bring in relay power (87) directly from the battery. I'm not sure if I could find the oem relay for the int dome light, but if I could that's where I'd isolate the signal from the steering column switch that turns on the dome dome light and use that to trigger a relay for the rear lights...anybody know where they hid it?
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Old 12-26-2012, 07:53 PM   #26
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Never got to do this. I was never able to determine which wire(s) I needed to splice into. I had actually purchased and installed the lights except for the wiring. I went to a wrenching party from an invite on another forum. The host said that he knew how to do the wiring and would help me out. After helping him install a complete exhaust system and River Raider skid system, he left me hanging and did nothing for me. I ended up returning the lights.
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Old 12-26-2012, 08:19 PM   #27
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Never got to do this. I was never able to determine which wire(s) I needed to splice into. I had actually purchased and installed the lights except for the wiring. I went to a wrenching party from an invite on another forum. The host said that he knew how to do the wiring and would help me out. After helping him install a complete exhaust system and River Raider skid system, he left me hanging and did nothing for me. I ended up returning the lights.
That sux! If you wanna try again, I'll tell you exactly how to do the backup only lights cuz ill have that wire in my hot little hand real soon

The way I plan to find the wire is take off one of the rear lenses and pull the plug for the backup light. Put her in reverse, pull up the p-Brake and use an meter to find the hot wire. Once identified ill use that on a relay (86) to trigger the backup lights. That's the easy part, but I wanna go an additional step in order to be able to turn them on when not in reverse too using the switch on the steering column for the dome light
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Old 12-26-2012, 09:03 PM   #28
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I too thought I'd jump into this thread rather than start a new one. I'm adding a rear bumper with built in lights (4" fog style) and would like them to light up when I'm in reverse to supplement the weak oem reverse lights. Can I just directly tap into the reverse lights to power these two additional lights?
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Old 12-27-2012, 02:35 AM   #29
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I too thought I'd jump into this thread rather than start a new one. I'm adding a rear bumper with built in lights (4" fog style) and would like them to light up when I'm in reverse to supplement the weak oem reverse lights. Can I just directly tap into the reverse lights to power these two additional lights?
Yes, just use a relay and have the signal from the reverse wire as the switched input. It gets more complicated if you also want to be able to turn them on with a switch as diodes are required. But it's still quite easy.
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Old 12-27-2012, 05:37 AM   #30
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I too thought I'd jump into this thread rather than start a new one. I'm adding a rear bumper with built in lights (4" fog style) and would like them to light up when I'm in reverse to supplement the weak oem reverse lights. Can I just directly tap into the reverse lights to power these two additional lights?
Just add one of these buggers:
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