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Ford LCM Issue? #4530783
10/01/17 12:33 AM
10/01/17 12:33 AM
Joined: Oct 2008
Posts: 4,174
Kuwait
Falcon_LS Offline OP
Falcon_LS  Offline OP
Joined: Oct 2008
Posts: 4,174
Kuwait
More of an electrical issue than mechanical, but I'm facing a bit of a strange issue with the blinkers on my '01 Grand Marquis. There are zero issues with the turn signals when the lights are off, but if the lights are on, either automatically or manually, I have a hyper flashing issue. When you first turn on the blinker on either side, it'll flash normally for a second or two then start to hyper flash. No issue with the hazard flashers, none of the bulbs are out and I don't have LEDs or anything.

Not quite sure where to start with this one, and quite hesitant to dump crazy money on an LCM if it isn't the culprit. Any input will be appreciated, thank you!


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
03 Expedition SSV: XG2
05 Envoy: XG9837
06 XJ8L: C2C41611
07 SRX: XG8765
Re: Ford LCM Issue? [Re: Falcon_LS] #4530788
10/01/17 12:42 AM
10/01/17 12:42 AM
Joined: Aug 2006
Posts: 9,887
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,887
Central Washington
I suspect a ground issue. The headlamps and turn/park on the front all share a common ground along with a TON of almost everything else in the engine compartment, ABS, wiper motor, etc. Its G102, Right hand front fender, centerish.. I would check the voltage at the ground pin of the front turn signal bulb with headlights on/off compared to at the battery. If its significant, that is your issue.

Same thing at the back, all the bulbs share a ground, G400. Its at the rear of the trunk, center, right be low the latch. Youll need to check for voltage drop at the bulbs there as well.

Last edited by Colt45ws; 10/01/17 12:44 AM.

-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: Ford LCM Issue? [Re: Falcon_LS] #4530793
10/01/17 12:54 AM
10/01/17 12:54 AM
Joined: Oct 2008
Posts: 4,174
Kuwait
Falcon_LS Offline OP
Falcon_LS  Offline OP
Joined: Oct 2008
Posts: 4,174
Kuwait
Thanks, Colt! thumbsup For the front, is that the one behind the washer fluid reservoir?


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
03 Expedition SSV: XG2
05 Envoy: XG9837
06 XJ8L: C2C41611
07 SRX: XG8765
Re: Ford LCM Issue? [Re: Falcon_LS] #4530795
10/01/17 12:59 AM
10/01/17 12:59 AM
Joined: Aug 2006
Posts: 9,887
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,887
Central Washington
Negative, its by the battery. The battery has its own ground bolt on the fender, and right below it is the one we are talking about. Comes from the harness leading to the battery fuse box.

It looks like the engine fan also grounds there. I bet you run the a/c all the time and hence the fan is always running. You might test it with the a/c off and the fan motor off to see if that changes anything. If so, that would eliminate the rear one as being the problem.

Last edited by Colt45ws; 10/01/17 12:59 AM.

-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2
Re: Ford LCM Issue? [Re: Falcon_LS] #4530805
10/01/17 01:12 AM
10/01/17 01:12 AM
Joined: Oct 2008
Posts: 4,174
Kuwait
Falcon_LS Offline OP
Falcon_LS  Offline OP
Joined: Oct 2008
Posts: 4,174
Kuwait
Gotcha, I was thinking about the other side. I'll take a look at that and report back. thumbsup


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
03 Expedition SSV: XG2
05 Envoy: XG9837
06 XJ8L: C2C41611
07 SRX: XG8765
Re: Ford LCM Issue? [Re: Falcon_LS] #4530819
10/01/17 01:52 AM
10/01/17 01:52 AM
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Hyper flashing is built into flashers to tell you something is not right, usually a bad connection at an automotive connector or a burnt out bulb.

It could potentially be a ground wire, but usually all the lamps share the same ground, so if the side marker lamps at that corner are working (for example) the ground is good up to the lamp module or nearby connector. First thing to try is to remove the back of the offending lamp (usually pop-off plastic) and clean everything up with a suitable cleaner (I use home-made Windex*, but anything that doesn't leave a residue is fine).

* Home-Made Windex:
1 ounce household ammonia, two drops (no more, no less) of liquid dish soap, fill spray bottle with water. I add a drop of blue food colouring so I can easily identify it as a Windex substitute. If it really matters to you, you can add a drop or two of a liquid scent so that it doesn't smell like ammonia, but I don't.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]

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