Trailer Plug Problem AGAIN! - Defender Source
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  #1  
Old June 7th, 2011, 10:56 PM
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Douglas Wozny
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Trailer Plug Problem AGAIN!

I am going to be very frank about this and state at the beginning I do not expect any useful information to come out of this posting. But as the saying goes if at first you don't get an answer, try, try again!

From the vehicle's (1994 D90) trailer plug come 4 wires: white (ground), brown (drive taillights), green (right stop/turn light) and yellow (left stop/turn light). They go to a box behind the right rerat speaker that has 5 wires coming out of it. White that is connected to 2 green/brown wires; black that is connected to 2 red/black wires; yellow that is connected to 2 red/green wires; red that is connected to 1 purple wire and a green wire that is not connect to anything.

Now here is the problem: with the key out of the ignition, nothing turned on, just like you would leave it as if going to bed for the night if I place a test light probe in the ground socket of the vehicle's trailer plug and touch socket for the right stop/turn light you know what happens? IT LIGHTS UP! The same thing happens if I do the ground and left stop/turn light socket. I have traced the source of the current to the the purple wire that is connected to the red wire coming out of the far side of the "black box". What is that purple wire? Is it suppose to be hot (I don't think so)? And if it is NOT suppose to be hot, why is it hot? Is the "blacl box" connected correctly? Or does anyone really know if it is wired correctly?

I apologize for my attitude but I am frustrated by the lack of information/help about what should be a simple wiring exercise.
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To paraphase "Oddball" (Donald Sutlerland, "Kelly's Heros", 1970) "I only drive 'em, I don't know how to fix them."
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  #2  
Old June 7th, 2011, 11:30 PM
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Neill Thornton
1984 D90 300 Tdi / 1965 Series IIA
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Is the other side of that black box a round plug?
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  #3  
Old June 8th, 2011, 07:58 AM
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Tom Rowe
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If it's the vehicle side of the adaptor box, then I think it's the auxiliary power feed, fed through a 30a fuse (F1) in the engine compartment fuse box and hot all the time.
At least that's what it is in the wiring diagram I have.
It sounds like someone wired the light adapter wrong.
Though there are adapters that are powered to provide for extra lighting. If it's that type then maybe the adapter has failed in always on mode.
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  #4  
Old June 8th, 2011, 08:15 AM
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Douglas Wozny
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Navydevildoc,
The vehicle side of the "black box" has individual wires ending in spade connectors on each wire. No round plug.
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To paraphase "Oddball" (Donald Sutlerland, "Kelly's Heros", 1970) "I only drive 'em, I don't know how to fix them."
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  #5  
Old June 8th, 2011, 09:04 AM
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Dave Sherwood
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Post a pic,
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  #6  
Old June 8th, 2011, 09:22 AM
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kevin
1994 D90 300tdi #730, SIII 88
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Purple is an accessory hot wire ( ignition off), so yes it should be hot.
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  #7  
Old June 8th, 2011, 09:49 AM
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Douglas Wozny
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Kevkon,
So, is that voltage from the purple wire suppose to be getting to the wires (green and yellow wires on the plug side of the "black box") for the stop/turn lights? I don't think so! Does this mean the "black box " is bad?

DMSLongLake,
Will try to take and post pictures this evening.

Does anyone have information (pictures, diagrams, written instructions, youtube video) on how the "black box" is to be hooked up?
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To paraphase "Oddball" (Donald Sutlerland, "Kelly's Heros", 1970) "I only drive 'em, I don't know how to fix them."
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  #8  
Old June 8th, 2011, 10:15 AM
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Tony Sims
1984 110
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It means the purple wire should not be included in your trailer plug wiring.

http://tinyurl.com/5vqepub

http://www.accessconnect.com/taillight_converter.htm

You can DIY it and avoid the cheapo converters, see pic.
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  #9  
Old June 8th, 2011, 11:40 AM
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J. Michael McCaig
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I have the same sort of converter box on both my D90 and 110 and I don't have any current bleed through as you describe. As stated, the converters aren't expensive. I would go ahead and replace it using the instructions provided with the new unit. The one on my 110 is a univeral converter I bought at NAPA years ago.
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  #10  
Old June 8th, 2011, 12:06 PM
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Douglas Wozny
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From the information supplied by TS888 it looks like my convert box is INCORRECTLY wired! My green wire (on the vehicle side of the box) is NOT connected to anything and it should go to the vehicle's right turn light. My red wire (on the vehicle side of the box) is connected to a purple wire (which Kevkon says is an accessory hot wire) but it should be connected to the vehicle's left stop light.
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  #11  
Old June 8th, 2011, 01:04 PM
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That's right unless for some reason you want constant power without the ignition.
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  #12  
Old June 8th, 2011, 07:05 PM
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Douglas Wozny
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I take back what I said in my original post. I got the information I needed and would like to thank everyone who answered. This evening I corrected the connections to the converter box and the vehicle trailer connector seems to be working correctly. At least the test light lights when it should and doesn't when it should not. Will have to wait until Friday to test with the trailer but I think I have the monster on the run. Thank you everyone.
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  #13  
Old June 8th, 2011, 09:45 PM
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Tom Rowe
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Quote:
Originally Posted by The Wizard View Post
From the information supplied by TS888 it looks like my convert box is INCORRECTLY wired! My green wire (on the vehicle side of the box) is NOT connected to anything and it should go to the vehicle's right turn light. My red wire (on the vehicle side of the box) is connected to a purple wire (which Kevkon says is an accessory hot wire) but it should be connected to the vehicle's left stop light.
Glad you got it sorted, but for others reading later, it's not always necessarily the case.

There are aftermarket converters available that are powered and the large red wire on the vehicle side of the converter would actually be connected to the purple aux wire. They usually have 6 wires on the vehicle side including a smaller red that connects to the brake and a larger red that connects to the always live.
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Tom Rowe
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Four wheel drive allows you to get stuck
in places even more inaccessible.

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67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
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  #14  
Old June 10th, 2011, 08:47 PM
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Douglas Wozny
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Well, hooked the trailer up to the D90 this eevning and guess what. PROBLEMS! With any of the light (turn, stop, running) on the backup light on the D90 came on (faint but on). Also with the D90 in reverse and the backup light on as it should be the trailer lights were on. Better yet when checking the vehicle's trailer plug with a test light, one end clipped to the frame and the probe touching the ground socket IT CAME ON! I think I know what the problem is. I did not check to see if the ground wire on the vehicle side of the converter box was attached to the proper wire. I just assumed (and we all know what that does) IT was connected properly. The converter box was installed by the Land Rovwer dealer here in town. So I suppect the ground wire is connected to the backup light wire and not to a ground. Will go back in and find the ground wire or just attach the converter box ground to some ground point.

The story continues and I will update if and when all is working as it should be.
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  #15  
Old June 12th, 2011, 04:13 PM
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Douglas Wozny
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Success!

Just got done hooking the trailer to the D90 and checking the function of the lights. Everything works. At least for the time being. Rule number 1 when working on any problem check the installation even if you did it yourself but especially if someone else did even a dealer. My only concern now is that the connects between the converter box and vehicle wiring harness stay connected. Going to look into doing a "proper" connection. Oh by the way, why do they insist on putting 10 pounds of wiring in a 5 pound space and having wires JUST long enough?

Anyway thanks for the help.
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