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#3659226 - 06/11/17 10:15 AM No turn signals at all
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
Hi guys new to the forum here, and astounded about the amount of information here. Very impressive, but im making this post because I seemed to run out of all other options.

I have a 08 MGM, had a fast flasher and it was the left rear tail light. I left the turn signal on and removed bulb and put the new one in, it worked normal for a second then everything just stopped. Thought maybe I blew a fuse but there are no turn signal fuses, so I replaced the mfs and nothing still. So I read up about the lcm relay cooking itself thinking that has to be it, so I did the bypass with a flasher unit between the 2 white/red and light blue wires and still nothing. I dont know where else to look as it seems I tried everything.

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#3662162 - 06/15/17 06:41 AM Re: No turn signals at all [Re: Mailtroll]
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
Thanks for all the help, you guys are awesome.

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#3662410 - 06/15/17 11:11 AM Re: No turn signals at all [Re: Mailtroll]
RF_Overlord Online   content

Poobah

Registered: 12/14/02
Posts: 7080
Loc: MA
Get a wiring diagram and start tracing the wires from the bulb on back and see where you're losing voltage. Does the left front blinker work? Do the right side blinkers work? The 4-ways?
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#3662434 - 06/15/17 11:57 AM Re: No turn signals at all [Re: Mailtroll]
reminc70 Offline
Member

Registered: 12/15/13
Posts: 466
Loc: Omaha, NE
A heads up, Body & Interior might be the section with the least traffic, just refresh your post if it's not getting responses/answers. Sometimes including "HELP" in the title doesn't hurt lol.

Here's a wiring diagram from the lighting control module out on an '04 crown vic. I'm not sure how similar the two are but it's a good starting point.



The harness for the rear lights goes through the cavity behind the license plate on the trunk ending at the ?right/passenger side tail light? if my memory is correct. That's where I would start tracing the wiring harness. It goes under the back seat and that is an easy place to check, I believe the oxygen sensor wires branch off there also so it's easy to find by tracing those back. I could be totally off-base here (I have a pretty basic knowledge of electrical diagnosis), but the problem could reside in the LCM, I know the LCM was the issue for my fast-blinker condition on my GMQ. There are some guys on here that have much more knowledge on the subject than I do but hopefully this gets the ball rolling.

Can you give us some more info? What lights are still working? Is the problem isolated to the left/drivers side? The more info we have the better help people can give.
_________________________
2010 CVPI 126,000 (Former Omaha, NE PD Vehicle)
2008 CVPI 138,000 (Former Springfield, MO PD Cruiser)
1999 Grand Marquis LS 124,000 (Former Senior Citizen Cruiser)
1999 Lincoln Navigator 5.4 16v 180,000


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#3662450 - 06/15/17 12:15 PM Re: No turn signals at all [Re: Mailtroll]
metro21 Offline
Over the Hill

Registered: 03/13/09
Posts: 1007
Loc: CA
_________________________
Current Panther: White 2007 CVPI SAP, 165k, Former State DOJ Admin Car
Formerly Owned Panthers: Gold 00 CVPI SAP and Black 05 CVPI SAP.

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#3662578 - 06/15/17 01:30 PM Re: No turn signals at all [Re: Mailtroll]
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
Thanks, im new to the forum and a bit frustrated with this. I forgot to mention that I was probing for trailer connections earlier and before that It was working fine so maybe something I shorted?


Edited by Mailtroll (06/15/17 01:35 PM)

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#3662594 - 06/15/17 01:39 PM Re: No turn signals at all [Re: reminc70]
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
The turn signals are totally dead, no power for either left or right. Activation the switch does nothing.

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#3662626 - 06/15/17 02:35 PM Re: No turn signals at all [Re: Mailtroll]
reminc70 Offline
Member

Registered: 12/15/13
Posts: 466
Loc: Omaha, NE
OK, I think it's a safe bet that's where (probing) your problems originated. Where exactly were you probing? Are the brake lights still working? Or is there absolutely no power at all tof both assemblies?
_________________________
2010 CVPI 126,000 (Former Omaha, NE PD Vehicle)
2008 CVPI 138,000 (Former Springfield, MO PD Cruiser)
1999 Grand Marquis LS 124,000 (Former Senior Citizen Cruiser)
1999 Lincoln Navigator 5.4 16v 180,000


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#3662634 - 06/15/17 02:50 PM Re: No turn signals at all [Re: Mailtroll]
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
I was probing the driver side rear tail light connector, the one inside the trunk. Brake and running lights are fine, just when I have my foot on the brake then use the turn signal is when the bulb goes completely dead. I probed right up to the lcm and there is power at the light blue/white-red wires until you use the signal then it loses all voltage.

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#3662858 - 06/15/17 05:01 PM Re: No turn signals at all [Re: Mailtroll]
reminc70 Offline
Member

Registered: 12/15/13
Posts: 466
Loc: Omaha, NE
I'm hoping one of the gurus will stop by and offer their expertise. I do know that the circuitry in the LCM itself can go out (it's pretty rare as a maintenance issue, but the probing might have done it). I know I've released the white electrical death smoke using a probe. In this case I would check the board itself, see if there is any visible discoloration on either side etc. Another thing to do is check the grounds, I want to say they're behind the driver kick panel (I might be completely off, I think I saw that in another thread and I'm not sure which generation of panther it was).

When I was trying to solve my issue I got frustrated and got an LCM from the junkyard and put it in. It fixed my problem, and I can't give you an exact cause or location for the failure. I hate to reccomend you to throw part(s) at it but that might be your easiest and cheapest (from the scrap yard) course of action.
_________________________
2010 CVPI 126,000 (Former Omaha, NE PD Vehicle)
2008 CVPI 138,000 (Former Springfield, MO PD Cruiser)
1999 Grand Marquis LS 124,000 (Former Senior Citizen Cruiser)
1999 Lincoln Navigator 5.4 16v 180,000


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#3662930 - 06/15/17 05:31 PM Re: No turn signals at all [Re: Mailtroll]
disston Offline
Over the Hill

Registered: 06/28/07
Posts: 1141
Loc: Maryland
I had a problem with the turn signals in my 2009 CV P71. It would blow the fuse to the turn signals if I used the right turn signal, then I had no turn signals. I tell you this story so I can emphatically say there is a fuse to the turn signals.

I forget which one it is and the owners manual is outside in the car so I will next tell you how I go about finding a blown fuse when I don't know which fuse it is. I ground the alligator clip of my test light somewhere under the dash and I probe first one side of each fuse. Then if the fuse has power at one side I probe the other side. If any fuse has power to only one side it is a blown fuse. I probe both sides because some fuses only have power when the item used is on or when the engine is cranking or sometimes for other reasons.

It sounds like a lot of work but it is not. It is how I play with the electrical system when I'm trying to figure out what it's doing. I take my time and I check each fuse.

Actually doesn't take as much time as it seems.

When I was having a bunch of electrical problems I found once 4 blown fuses. Replaced all of them. Never figured out why I had that many fuses blown. Another time I found 2 blown fuses.

After replacing a fuse check with the test light to see if it doesn't blow again right away.

If you are going to mess with the electrical system and hope to have any chance of fixing it I highly recommend getting the Ford wiring manual for that year. Here is a link to one on Ebay.http://www.ebay.com/itm/2008-Ford-Crown-Victoria-Mercury-Grand-Marquis-Electrical-Wiring-Diagram-Manual-/302333930343?hash=item466481ab67:g:jVcAAOSwcB5ZLiVA&vxp=mtrI have bought a new/used wiring manual for each of my new to me cars for the last 20 years from Ebay. For my Crown Vic I think I paid only $25 for one. This one is higher but you can't find the cheaper one then you will have to buy the expensive one.

The fuses are listed in the owner's manual. I think that this and the wiring manual are a must have for my cars because I fix my cars. I don't look at the bunch of multi colored wires and hope that by some magic I will be able to do that.

Sorry about that link but I don't seem to be able to make it work. Wiring manuals for each year are generally available on Ebay.



Edited by disston (06/15/17 05:35 PM)

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#3662962 - 06/15/17 05:59 PM Re: No turn signals at all [Re: reminc70]
reminc70 Offline
Member

Registered: 12/15/13
Posts: 466
Loc: Omaha, NE
Here's your fuse diagram with the turn-signal fuse highlighted. Definitely worth a shot, that would be a nice easy fix.



Not sure why the embedded link isn't showing up, if you right click it and open it in a new tab it should come up


Edited by reminc70 (06/15/17 06:03 PM)
_________________________
2010 CVPI 126,000 (Former Omaha, NE PD Vehicle)
2008 CVPI 138,000 (Former Springfield, MO PD Cruiser)
1999 Grand Marquis LS 124,000 (Former Senior Citizen Cruiser)
1999 Lincoln Navigator 5.4 16v 180,000


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#3663114 - 06/15/17 10:30 PM Re: No turn signals at all [Re: reminc70]
Mailtroll Offline
n00b

Registered: 05/11/17
Posts: 14
Loc: Texas
Thanks for the pic, but in my owners manual it says #11 is Ignition (ON/ACC) – window relay coil. I checked the fuse to make sure but it looks good.

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#3663138 - 06/15/17 10:53 PM Re: No turn signals at all [Re: Mailtroll]
disston Offline
Over the Hill

Registered: 06/28/07
Posts: 1141
Loc: Maryland
Looking at fuses doesn't always work. Heard that a number of times but didn't believe it till it happened to me. Had a fuse that looked good when I removed it and gave it the old eagle eye. Later when I had my test light handy I found that the fuse was bad all along.

The diagram says it is for 2007-2010 CV'c and GM's. Looks exactly like the diagram for my 2009 CV. And #11 was the fuse I blew whenever I used the right turn signal. I would also burn out #10 if I used the hazards.

I forget now how many but I checked the owner's manual for all fuses that go to the Light Control Module and I think it was 8 or 10 that I found had some function with the LCM. That was a pretty remarkable figure I thought.

It sounds like you have the wrong owner's manual.


Edited by disston (06/15/17 10:54 PM)

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#3663210 - 06/15/17 11:36 PM Re: No turn signals at all [Re: Mailtroll]
reminc70 Offline
Member

Registered: 12/15/13
Posts: 466
Loc: Omaha, NE
I agree with disston. I would check continuity on all fuses associated with the LCM. If it come up OK then it's time to move down the line and take a look at the board itself and maybe just throw a junkyard LCM in. If that's not it, it's time to perform the tedious task of checking grounds and tracing the harness. That's the route I would take with my own car.
_________________________
2010 CVPI 126,000 (Former Omaha, NE PD Vehicle)
2008 CVPI 138,000 (Former Springfield, MO PD Cruiser)
1999 Grand Marquis LS 124,000 (Former Senior Citizen Cruiser)
1999 Lincoln Navigator 5.4 16v 180,000


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