PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Results 1 to 16 of 16

Thread: Unidentified Wire

  1. #1
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Question Unidentified Wire

    Whilst wiring the new alternator; I was going to permanently disconnect the stock regulator plug (the new alternator came with its own plug and wire routing) when I came across a lone wire that comes off of the plug and ends with a pin terminal. I will see if my EVTM is still in my possession and look it up; but I would be very grateful if any of you know what this is off the top of your head(s).

    Thank You

    Click image for larger version. 

Name:	IMG_1463.JPEG 
Views:	37 
Size:	1.87 MB 
ID:	56100

  2. #2
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    Still can't find my EVTM. Regardless, I found what I think is the fuel injector ground. In the pic below, it's the wire with the 90* boot; lying right below the corner of the valve cover. I think it plugged into a stud on the stock lopo fuel rail IIRC. I might crimp a ring terminal on that and run it to one of the block grounds. Good idea? Bad idea?

    Click image for larger version. 

Name:	IMG_1464.JPEG 
Views:	19 
Size:	2.71 MB 
ID:	56151

  3. #3
    Member WagonMan's Avatar
    Join Date
    Sep 2004
    Location
    Bridgewater Ct.
    Posts
    738

    Default

    Bad idea. That 90 degree plug is for the water temp sender. WagonMan
    1990 Colony Park
    1970 HEMI Superbird

  4. #4
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    3,475

    Default

    The unidentified wire looks like it is something that fell out of a connector (retaining tab for that terminal broke). Not entirely sure what it goes to, but I'm poking around my '89 EVTM to see what I come up with.

    The right angle boot wire is for the Coolant Temperature Switch which lives in the front driver side corner of the lower intake. That switch is on at or above 249F and for a CV will illuminate the Engine Indicator (MGM has a Coolant Temp Indicator).
    Edit: confirmed by WagonMan
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  5. #5
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    For the sake of being ignorant; should I find a place for that temp sender ground? If I leave it unplugged, will it trip a CEL? I have a water temp gauge, so I'm not worried about not having that data.

    VicCrownVic: I will clean that wire off next chance I get and tell you the color of the pin terminal wire.
    Last edited by packman; 04-20-2021 at 04:30 PM.

  6. #6
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    3,475

    Default

    If you ground it, the CEL will illuminate. Unplugged your CEL will never illuminate.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  7. #7
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    22,235

    Default

    That's only for the idiot light. You can leave it unplugged if you have a real gauge.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  8. #8
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    Sweet! THanks for all of the quick replies. Can't type fast enough to respond

  9. #9
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    3,475

    Default

    On the unidentified wire, I'm actually more curious to see the other end of that wire. It looks like it is going into a round connector with 1 other wire (maybe 2 other wires?) I would like to get a better view of that connector and see if it is still present on my '91 which would help to figure out what that wire is.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  10. #10
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    40,275

    Default

    The wire in the first pic came out of a connector, no idea which but its not a ground.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  11. #11
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    1st pic I know is not a ground wire. It was something missed when I pulled the lopo. I suspected the pin terminal was inside of a connector of some sort; I just don't know which one or if it was something that went with the lopo. That round connector where the other end joins; both of the 2G charge wires go into it and the yellow signal wire for the alternator share that connector. I cut the charge wires long ago for the 3G swap; and left the yellow signal wire on there. I took no notice of the unidentified wire. If it's not storming when I get home; I will clean it off and at least get the color (I think it's yellow w/pink stripe).

  12. #12
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    3,475

    Default

    Looked through my '89 and '91 EVTMs, but still not finding that wire. I found the connector, but not what that specific wire is for. When I get a chance I'll look on my '91 and see if the connector and wires are the same. If they are the same I might have an answer later.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  13. #13
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    Thanks VicCrownVic

  14. #14
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    3,475

    Default

    I was able to look between meetings.
    I think '91 might be slightly different, but I think I see what connector that wire goes into but I still don't know what that wire does.
    On my '91 it goes into a gray connector, it's the only wire that goes into that gray connector on my car. The connector is a 4 pin connector but the other 3 terminals are unused on my car. On the other side of the connector there are White/Black, Black/Orange, Red, and White/Red. The White/Red is the only one that actually connects to anything (the mystery wire), the other 3 wires end at that connector (perhaps I don't have some option that would used those other 3. It is a low optioned LS.) The White/Red disappears into the harness so I'm not sure where it goes or what its function is. The EVTM doesn't give me any hints either.

    Here are some not great pictures of that wire and connector on my '91. It may not be the same on '86 though.

















    Attached Thumbnails Attached Thumbnails IMG_20210421_101321774.jpg   IMG_20210421_101333014.jpg   IMG_20210421_103959.jpg   IMG_20210421_104016.jpg   IMG_20210421_104108.jpg  

    IMG_20210421_104113.jpg   IMG_20210421_104131.jpg   IMG_20210421_104234.jpg   IMG_20210421_104225.jpg  
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning sometime in the 2020s, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - Rotting Retired Winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  15. #15
    Member of the Orb Alliance packman's Avatar
    Join Date
    Nov 2006
    Location
    Dirty Jersey Yo!
    Posts
    8,342

    Default

    Thank you so much for that effort! Maybe by '91, Ford changed the connectors for that wire. Either way, if it's important, I will find out during the first fireup.

  16. #16
    The Brown Blob 87gtVIC's Avatar
    Join Date
    Sep 2008
    Location
    Whitestone, NY
    Posts
    20,083

    Default

    Wild guess...something used for carbed applications...choke or something. I seem to recall a red and white wire that did nothing much but is fed off the fuse panel...kinda found it in that area as well..this is going years back now.


    Second thought it may have been red and yellow. Just food for thought.
    ~David~

    My 1987 Crown Victoria Coupe: The Brown Blob
    My 2004 Mercedes Benz E320:The Benz

    Quote Originally Posted by DerekTheGreat View Post
    But, that's just coming from me, this site's biggest pessimist. Best of luck

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
GMN Approved Links!


www.rockauto.com www.adtr.net