View Full Version : Mystery wire
12-01-2002, 12:16 PM
OK,,,,, I got one for ya guys,,,,<br> DD4x4 asked me about a single black wire with a eyelet on one end and the other end going into the wiring harness under the hood. It's located by the power distribution box (with all the fuses in it) on the driver's side inner fender. I've got the same wire on my 99 as well as every other truck we've looked at (99-00). So far, Keith (Rammin On) is the only one we've seen that is hooked up (grounded to the fender). The wire is just hanging around unhooked on the rest of the trucks. <br> Keith,,,, you were going to check on this in the book for us,,,,,, remember? ;) ,,,,, yeah we know,,,, you're sooo busy.<br> So what is the wire for? ???<br>
12-01-2002, 01:04 PM
Can't answer your question, however my 01.5 has the same wire and it's not connected to anything either.
12-01-2002, 01:17 PM
OK ..... I've buried myself looking for an answer to the mystery wire ..... and guess what?????? It remains a mystery ..... I did however find that it could be one of the following:<br><br>Lift pump ground<br>fuel heater ground<br>grid heater relay ground <br><br>I guess the only way to relly find out .... unless someone else knows ... is to strip the loom and follow it to it's component ....<br><br>Oh well ....
12-01-2002, 01:36 PM
<br>I guess the only way to relly find out .... unless someone else knows ... is to strip the loom and follow it to it's component ....<br><br>Oh well ....<br><br><br>So,,,, are ya gonna start doing that today so we can have an answer quickly? ::) [laugh] [laugh]<br>"Back to Square One"<br> <br>
diesel dave c
12-01-2002, 07:34 PM
Mine has it too (96) I think it has something to dowith the camper special package. My camper wiring that is in the bed is dead. I don't use it but the dealer said I had to hook it up under the hood??? Maybe ???
12-02-2002, 04:21 AM
I had a cable (black) that was disconnected as described. Measured resistance and found it was an additional ground for the trailer plug. <br>Warning: Don't suppose it's the same thing for your truck, mine has been modified for European lighting. <br><br>AlpineRAM
12-02-2002, 10:36 AM
When some of us were talking about it at a get-together, we wondered if it might have something to do with the snow-plow option. This was the only option that none of us had.<br> I guess it's not that important,,, we just thought it was kind of weird! [laugh]
12-02-2002, 08:25 PM
Don't quote me on this, but i think it is used for trailers with ABS,or something on the trailer that will require constant power. And so the mystery continues!! :)
12-03-2002, 07:52 AM
I just hate I had to bring that mystery wire up. Now everyone is pondering the diesel truck worlds greatest mystery, what is the mystery wire, instead of dealing with the lesser issues like world peace, global warming, hunger, and all that stuff. Where is Sherlock Holmes when you need him? Maybe Columbo could figure it out. Ah, lemme ah ask you ah just ah one more ah question?<br><br>I promise, I won't do it a gain. (till the next time)
12-03-2002, 08:42 AM
anyone call DC and ask? ::)
12-03-2002, 07:13 PM
I just went out and checked mine. I have the ABS and the trailer package . I didn't see any wire that was lose. There was one black wire, about a 10 or 8 gauge that came out of the side of the box and into the harness loom. Now what?<br><br>..Preston..
12-03-2002, 07:59 PM
Hey Preston,<br> I guess that means your 96 and Keith's 95 are one of the ones so far, that don't have it. Maybe we can narrow it down to what year it started. <br> Anyone with a 97 and 98 want to check theirs and let us know? ;D
12-03-2002, 08:01 PM
I found a mystery wire on my 96 CTD. It was dangling behind the leftside battery. It was a blk 8-10 ga. with a broken terminal. It was a ground wire connected under the front bumper. I could not fine where it connected. I finally checked a friend's 96 CTD and his was connected to the negative battery post. I connected mine there. It has corrected my cruise control which had been acting rather sluggish and it has caused my ABS/Brake to not turn on as often as it used too. Still turns on occasionally. My neg. battery terminal was completely corroded.
12-03-2002, 08:14 PM
The wire we found on about 7 different trucks, had never been hooked to anything. I think that 5 of the 7 were 99's and 2 were 00's. ???
12-03-2002, 08:26 PM
Well, just to complicate things just a bit, My `98 does have the tow package and ABS and YES, I have seen that very same wire. The plot thickens! [laugh]
12-04-2002, 12:20 AM
Never seen it on my 94. or my 95 gasser.<br>Aaron
12-04-2002, 07:21 PM
My 97 also has the towing package and ABS, and the mystery wire! I think this is a conspiracy ;D ;D
12-04-2002, 08:12 PM
I have this extra ground wire on my 98.<br><br>I did some checking in the wiring diagrams and from what I can tell it is a ground connection for an added accessory of some sort. It is not identified as to what it goes to, except to ground. If you traced it back in the wiring harness, I think you will find that the other end of it is to a ground splice in the harness.<br><br>This is all assuming that the wire I found in the schematic is this wire. I cannot tell for sure, without going into the harness. Seems like too much trouble.<br><br>If this is the wire, then it is for some accessory, since the other end is ground. <br><br>Looking at the end of the wire, I think it would attach to the housing of the accessory to give it a positive ground.<br><br>All this is speculation and subject to change. I have no idea what accessory this could be for.<br><br>Dan
12-04-2002, 11:57 PM
I feel left out. Wheres my wire. :'(<br> ;D
12-05-2002, 12:58 AM
I pulled my wire.... [laugh]
12-05-2002, 06:00 PM
Well,,,,,,,,,, ::) ,,,,,,, At least by posting this thread, we have alerted other folks to the "Mystery Wire". When Joel (DD4x4) brought this up to me,, I was glad to find out before I found it after doing some custom wiring on my own and then discovered it. :o I probably would have gone nuts thinking I must have disconnected it and now I can't remember from where. At least now we know it's supposed to be there,,,,, why? ??? Don't ask,,,,, Doesn't make any difference,,,,, it's just supposed to be there! [laugh]<br> So who wants to volunteer to hook that sucker up to 12v positive and let us know where the first signs of smoke come from?? ::) JUST KIDDING,,,,, [laugh] [laugh]
12-06-2002, 09:04 AM
Dennis, you go first [laugh] [laugh] [laugh]
12-06-2002, 09:13 AM
Careful NW ... he just might do it!
12-06-2002, 04:02 PM
Why do I get this vision of two DC workers who are sitting on the assembly line one Friday afternoon and are discussing thier weekend <br>when one guy says to the other:<br><br>"Hey buddy... lets add this little black wire on some trucks but not others!"<br><br>To which the buddy answers:<br> "Yeah... we'll have these guys guessing for months as to what the **** this wire is for!"<br><br> [laugh]<br><br>Rich
12-06-2002, 07:28 PM
Ya know Rich,,,,,,,,,,<br> I was thinkin the same thing! [laugh] [laugh] [laugh]
12-07-2002, 07:29 PM
Today while in campground at gathering think we figured out that trucks with rear wheel anti lock brakes wire is grounded checked a 1999 and 2001 both with rear wheel anti lock only and it is grounded. The other 3 trucks with 4 wheel anti lock are not grounded. Hopefully this will shed some light to what this wire is.
12-07-2002, 07:53 PM
<br>Today while in campground at gathering think we figured out that trucks with rear wheel anti lock brakes wire is grounded checked a 1999 and 2001 both with rear wheel anti lock only and it is grounded. The other 3 trucks with 4 wheel anti lock are not grounded. Hopefully this will shed some light to what this wire is.<br><br><br>Way to go guys! ;D<br> So far, this is the first break through in solving the mystery. My 99 has four wheel anti-lock and the wire is not connected, so let's hear from some others.<br> BTW,,,, Glad to see ya made it to the campground. I hope ya'll had a good time. ;D
12-07-2002, 08:49 PM
I really need to find out what this wire is for. I can't sleep, I can't eat, this is killing me. ;D ;D ;D
12-07-2002, 09:03 PM
Hmmm, you may be on to something. I too have 4 wheel anti-lock on my `98. ::)
12-07-2002, 09:36 PM
Hey Rattlin.......my little black wire IS connected to ground.
12-07-2002, 10:26 PM
Mine is four wheel antilocks and the wire is not connected.<br><br>Dan
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