Marker Light Turn Signal Mod - Cleaner Wiring - Jeep Wrangler Forum

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Old 07-20-2013, 11:59 PM   #1
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Marker Light Turn Signal Mod - Cleaner Wiring

I did the marker light mod today so that my front fender marker light also acts as a turn signal. I have some details for an approach that will give you some very clean/simple wiring.

Refer to this thread for a full discussion of the mod itself: http://www.wranglerforum.com/f33/mar...on-112417.html

And especially refer to this link if you want an explanation of how/why it works: Daniel Stern Lighting Consultancy and Supply

One thing I didn't like about various instructions/suggestions I found online was that they usually involved stringing a wire between the wire loom for the turn signal, and the wire loom for the marker light. Some instructions I've seen lead to the two wire looms being bridged by the wire in a way that prevents the wire looms from being removed for repairs in the future without cutting the wire, as well as having a single wire (and possibly it's connections) exposed in the wheel well area. I decided to follow the two looms up to where they merge into a single loom so that I have easy access to both wires right next to each other, with the end result looking indistinguishable from original factory wiring.

First, open the hood and remove the grill. I can add pictures/details for removing the grill if I get requests to do so. Or if someone can point me to a good forum thread with detailed pictures/instructions, then I'll link to it here.

The junction of the two wire looms you want is behind the headlight, so remove it (4 small torx screws). All following photos are from the driver's side headlight.



Pop the connector off the back of the headlight (one of those slide-the-red-tab-out-before-you-can-squeeze-and-pull types). This is what you should see with the headlight out of the way:



(green connector is headlight connector)

1) The wire loom junction. That's where you want to access/splice the wires.

2) Connector for the marker light. You need to disconnect the connector AND release the wire-loom-side connector from a plastic tab. To do so, gently pull the bottom of the connector body out towards you and slide the connector body down.

3) A pain-in-the-butt anchored zip-tie holding the turn signal wire loom. It's anchored with one of those barbed plastic plug things. With some patience and persistence, you can wiggle, pull, push from the back, and pop it free.

Also disconnect the yellow connector, and then you'll be able to pull the whole wire loom out like this:



1) Remove that electrical tape to expose the wires.

2) Marker light connector (loom-side).

3) That pain-in-the-but anchored zip tie, popped out.

4) Marker light connector (light-side).

5) Turn signal connector.


A closer look at the turn signal connector:



Black is ground. Middle wire is running/parking light. Last wire (as indicated by screwdriver) is the turn signal. This is the wire you want. Locate the same wire up at the wire loom junction:



And just to the left of of that, you can see the two wires for the marker light. The black (ground) wire from the marker light needs to be connected to the turn signal wire.

Here, you can see I have one of those wretched splice connectors (more on that later) sitting on the turn signal wire while I cut the black wire from the marker light:



And splice the black wire to the turn signal wire (the part of the black wire that is on the same side of the cut as the marker light connector).





And wrap it back up with electrical tape:



Simple, clean, doesn't require any additional wire, and doesn't look at all different than original . Now just put it all back together (reverse what you did to take it apart), and do the other side the same way.

Now about that plastic splice connector: I actually prefer to strip away insulation, solder the connection, and seal the connection with liquid electrical tape. This should create the cleanest, most professional, and most weather-proof result. Just be sure that the soldered connection is in a place that is not going to flex or vibrate against something hard, because soldered connections can eventually break if stressed (solder is brittle). I actually plan to re-do these connections this way soon.

I had no power at the house and was bored. I just used the splice connectors that I had sitting around so I could do something productive. If you're not comfortable with stripping insulation and soldering, then a weather-proof splice connector wrapped well in electrical tape should be just fine as well.
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Old 07-21-2013, 02:28 AM   #2
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Nice write up, I like how it's a cleaner design too, I'm always picky about that myself.

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Old 07-22-2013, 10:03 PM   #3
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I couldn't stand having those splice connectors any longer, so I soldered it up properly today:



And coated it with liquid electrical tape for a weather-proof connection:




Also, here's some details on removing the grill: http://www.wranglerforum.com/f33/how...ll-257672.html

I couldn't find any way to edit the original post to refer to the grill removal thread
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Old 01-12-2014, 03:47 PM   #4
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I just did the 2-wire mod (just cut the existing wires to the marker light and merge them in with the turn signal wiring). quick and easy and seems to work as advertised.
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Old 09-27-2014, 03:10 PM   #5
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Great Modification...works on 2015 JKU
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Old 09-28-2014, 02:45 PM   #6
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I did this mod today as well and it worked without a hitch. I was adding a mesh grill backing so figured I should do them both at the same time, along with removing those orange side markers for clear ones.
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Old 09-28-2014, 03:02 PM   #7
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Great writeup with useful detail to keep dummies (like me) from getting themselves in trouble. I do have to ask whether the alleged safety benefit is really there? Sure, it can't hurt, but does it help to be worth one hour of my time? Oh wait, I spray painted the damn muffler, I have lots of low value time 😊

One more serious question: this seems to wire the side markers in parallel with the turn signals, which likely halves the load resistance. Any concerns about fuses or other ancillary stress to the drive circuit?
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Old 10-31-2014, 04:14 PM   #8
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Will this mod work on a 2004 TJ?
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Old 10-31-2014, 08:30 PM   #9
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Quote:
Originally Posted by GroovyGeek View Post
One more serious question: this seems to wire the side markers in parallel with the turn signals, which likely halves the load resistance. Any concerns about fuses or other ancillary stress to the drive circuit?
I haven't had any issues yet, and I haven't heard of anyone else with this mod having issues.




Don't know about the 2004 TJ. I would guess it would work, but you're on your own identifying which wires to work with.
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Old 02-18-2015, 12:47 AM   #10
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Great write up made it easy to do this mod today in under a half hour. I soldered the wires, used liquid electric tape, then once it dried covered it with normal electric tape to be safe. Like how the lights wig wag when the headlights are on.
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Old 03-15-2015, 02:26 PM   #11
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Question

Wow, nice and clean! Does the mod done per these instructions result in alternating blinking of the two lights or blinking at the same time?

Quote:
Originally Posted by Notar1 View Post
Like how the lights wig wag when the headlights are on.
"Wig wag"?
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Old 03-15-2015, 02:48 PM   #12
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Depends on whether the parking lights are on or not.

Parking lights off: marker light blinks with turn signal.
Parking lights on: marker light blinks opposite of turn signal.

The marker light still functions as a parking light with this mod.


The "wig wag" was a description of how the marker light and turn signal blink in an alternating fashion when the headlights (more specifically, the parking lights) are on.
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Old 03-15-2015, 03:00 PM   #13
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Notar let me take a wild guess and say you know a little something about airfield lighting, namely elevated guard bar lights...AKA wig wags.

Oh and OP glad you changed out those suit case splices, they are a failure waiting to happen... nice write-up.
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Old 07-12-2015, 09:16 AM   #14
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Nice write-up. Thank you! I'm going to this mod very, very soon... I'm hoping to do a DIY grill insert soon, so I'll likely tackle both at the same time.

Quote:
Originally Posted by GroovyGeek View Post
... I do have to ask whether the alleged safety benefit is really there? Sure, it can't hurt, but does it help to be worth one hour of my time?...
Just to touch on this, because I saw a lot of "this mod is useless" posts in the original thread...

The other day, I was driving on a three lane highway and I was driving parallel with another car, but we were both in the outer lanes. Both of our lanes were crowded, but the middle lane wasn't as bad. I wanted to change into it right away, but I already knew the side marker light did not work as a turn signal, and I didn't want to merge without him seeing a signal.

A second later, he flipped on his signal and went.

If I had assumed the side marker light worked as a turn signal light (as it should from the factory, BTW), and flicked on my signal, with no effect for him to see, and I started to change lanes, we may have gotten into an accident.

Sure, I'm always extra cautious in those situations anyway, and I likely still would have waited even with the turn signal just to make sure he wasn't going to jump out, but at least my turn signal would have let him know what I was planning to do.
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Old 07-18-2015, 07:37 PM   #15
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Thanks for posting this. I just finished the project and pulling the headlights was very useful.
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Old 08-06-2015, 06:16 PM   #16
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I have the poison Spyder LED marker/turn signal lights. This comes with 3 wires. I connected the white and black to the marker light wires so as of now they only work as a marker lights. However I still have 1 wire left that I need to wire to the turn signal. I'm guessing splice it with the white/grey wire from the turn signal for this to work?!
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Old 08-08-2015, 06:57 PM   #17
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Thank you UselessPickles! I just completed this mod and with your great pictures and write-up, it sure made the job easy! I was adding a hood lock to my domed hood and figured I'd give it a try. This mod worked great and its pretty cool. Thanks again!
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Old 10-21-2015, 06:01 AM   #18
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different year models?

Okay, I would like to do this mod, however; I've seen and read post/videos that contradict each other in that the (1) one wire method works on some years and not on others. Just as the (2) two wire method has the same result. Mine is a '13 and I have seen that one works on some post and the other, it did not. ????

It looks as though some models look to have slightly different wire connectors to the turn signal. One shows the wiring going in from a 90* angle and the other straight in. Does this possibly tell which method has to be used?

Which wiring plug does your JK have and what year is it? If in fact that is the factor?
OP, your's is a 2013, right? And your plug looks to be the one that goes straight in.
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Old 10-21-2015, 08:41 AM   #19
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Oh well, I decided to just snip the wires and go for it.....test worked. So, I completed the mod similar to the OP's only I used similar gauge wire that I had to have more room to work with and buttoned it up nicely. Much more professional looking doing it this way (OP's). I didn't like the idea of trusting those plastic dohickies either, even though I did have dialect grease.

Oh yeah, my wire plug is the 90* angle type on a '13 JKU sport and I went with the (1) one wire method (black from marker to the White w/Pink stripe blinker), in case anyone needs to refer to this one. Works the same way as OP, Lights off or hazards-flash together. Lights on-alternating flash.
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Old 10-21-2015, 11:14 AM   #20
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Yes, mine is a 2013.

I think the "2-wire" version of this mod is simply rewiring the marker light in parallel with the turn signal so that it functions ONLY as a turn signal/hazard light, but no longer functions as a marker light.

The 2-wire mod should work no matter what kind of bulbs you have (would work with LED marker lights). But the 1-wire mod (described in this thread) will ONLY work with incandescent marker light bulbs.

Maybe there are some model years in some regions of the world that ship from the factory with LED bulbs, so that is why some people report the 1-wire mod not working on "some years"? Or maybe some people have installed aftermarket LED bulbs and didn't understand that the mod would not work with those bulbs?
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Old 10-21-2015, 12:52 PM   #21
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Quote:
Originally Posted by RubiChick View Post
I have the poison Spyder LED marker/turn signal lights. This comes with 3 wires. I connected the white and black to the marker light wires so as of now they only work as a marker lights. However I still have 1 wire left that I need to wire to the turn signal. I'm guessing splice it with the white/grey wire from the turn signal for this to work?!
I have the same question.

I was considering trying to wire an LED light strip or something similar to my side mirrors. This mod thread seems to address where to tie in the additional light, but I want to be certain before I attempt this mod.

Could I also wire in the side marker light along with the extra LED? I am also wondering about the person who posted the question about resistance, etc.

Here is the light I am looking at Rectangular LED Marker Lamp - Amber | Jeep 4X4 Off-Road LED Lighting | Poison Spyder Customs
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Old 02-27-2016, 12:51 PM   #22
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I did this mod on my 2015JK, just picked up my 2016 JKU RHR and and doing this mod this weekend.
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Old 02-27-2016, 01:45 PM   #23
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Nice write up. Subscribed for future reference.
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Old 02-27-2016, 08:07 PM   #24
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Just completed on my 2016 JKU RHR. Wiring on both my 2015 and 2016's were just as shown.
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Old 02-27-2016, 10:14 PM   #25
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Nice write up! Thank you
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Old 11-27-2016, 08:11 PM   #26
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Just wanted to say thanks for going the extra mile. I followed your lead and did the same. Pulled it all apart and spliced wires with solder way up where the loom all comes together. I used heat shrink and put it all back like stock. Didn't quite take half and hour and I was just messing about. Very easy mod. Thanks for your write up on this. BTW, 2015 Sport.
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Old 11-28-2016, 10:06 AM   #27
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Quote:
Originally Posted by RubiChick View Post
I have the poison Spyder LED marker/turn signal lights. This comes with 3 wires. I connected the white and black to the marker light wires so as of now they only work as a marker lights. However I still have 1 wire left that I need to wire to the turn signal. I'm guessing splice it with the white/grey wire from the turn signal for this to work?!
I'm not sure of the correct signal wire without looking at mine...but I have the same 3-wire setup (bullet style) in my MetalCloak fenders. I originally only had 2-wire...but I wanted them to be both marker lights AND turn signal lights- and there's no way for that to happen unless you have the 3-wire. The nice part is that when I have my headlights on (marker lights are lit up) and I turn on the signals, they get brighter than the original "marker" light when the signal comes on. So spice into your correct signal wire already & enjoy!

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