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#2106260 - 07/31/10 11:38 AM Turn signal is flashing brake lights
convict1997 Offline
Stranger

Registered: 02/27/10
Posts: 5
Loc: Concord NC
On my 97 grand marquis, when I activate the left turn signal, it flashes like normal, but it also flashes all of the brake lights (left, right, center) as if the emergency flashers were on. When I step on the brake with the turn signal activated, it stops the flashing and the left turn signals (front and back) and the indicator on the dash stay lit. If I step on the brake without the turn signal activated, the same thing happens. The left side turn signals and the dash indicator come on. The problem comes and goes. When going over bumps with the brakes on the turn signal indicator will flicker as if something is loose. Any ideas on where to start looking?


Edited by convict1997 (07/31/10 11:45 AM)

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#2106276 - 07/31/10 12:07 PM Re: Turn signal is flashing brake lights [Re: convict1997]
SPM Offline
Over the Hill

Registered: 09/10/09
Posts: 1468
Loc: Wisconsin
Sounds like shorted wiring. I used to own a full-size Chevy Blazer that did something similar; step on the brake pedal, and the taillights, instrument cluster, and front turn signals would all light up at once. In that case it was trailer hitch wiring that had rubbed against the body and was shorting.

A good place to start is back at your left lamp. Carefully check out the wiring and make sure there isn't any exposed.
_________________________

2005 Grand Marquis LS, 75K miles
2000 CVPI, 229K miles (Sold)

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#2106445 - 07/31/10 04:55 PM Re: Turn signal is flashing brake lights [Re: SPM]
Mantras Offline
n00b

Registered: 09/21/09
Posts: 26
Loc: Ottawa
The left turn/brake lamp bulb has melted the two poles together, so you're backfeeding the turn signal circuit. check the bulb, maybe put in a new one?
This happened to me and I could clearly see the bulb shorted at the
base.


Edited by Mantras (07/31/10 04:55 PM)
_________________________
2003 CVPI 151km
X5 3.27 Trac-Loc Axle (leaking from every hole)
HID Conversion
2004 CVPI 170km
Mystery Axle? (door sticker and axle tag gone)
Thrush Welded 2 Chamber mufflers, dumped.
2005 CVPI The Hotrod
Trick Flow 44cc heads w/Trick Flow valve covers
Comp XE268H Cams
Full Custom 2.5" mandrel bent exhaust with Flowmaster 40's
Lowered 1"
HID conversion
American Racing wheels 17x9 in the rear 17x7 front
Programmed with Diablosport Trinity T-1000

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#2106614 - 07/31/10 09:46 PM Re: Turn signal is flashing brake lights [Re: Mantras]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: UTL
 Originally Posted By: Mantras
The left turn/brake lamp bulb has melted the two poles together, so you're backfeeding the turn signal circuit. check the bulb, maybe put in a new one?
This happened to me and I could clearly see the bulb shorted at the
base.


What he said....

Unless you're running LED's and have a few bulbs backwards..
_________________________

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#2120716 - 08/20/10 11:55 AM Re: Turn signal is flashing brake lights [Re: TechnoWeenie]
convict1997 Offline
Stranger

Registered: 02/27/10
Posts: 5
Loc: Concord NC
Still haven't been able to fix this yet. I checked the bulbs and they looked fine. I haven't tried replacing them yet, but, that will be my next step. I checked the wiring in the trunk and everything looks okay. I just took the car on a trip to the beach and noticed something weird. Everything works fine when the car is cool and the outside temp is under 90 degrees. When it's any hotter out, or if I let the car idle and heat up, the problem returns. When in stop and go traffic, the problem occurs. Once I get on the open road, everything starts working again. Any ideas why the heat could be effecting this?

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