i have a 2005 mustang with my driver side taillight that light up but doesnt light up when brake is pressed. checked all exterior lights they all work just the driver side blinker is fast ....any suggestion? switch,bulb and location Thanks

 

Sounds like a bad bulb or 2. Very common for the turn signal to blink fast with a bulb out. The brakelight bulbs are dual element so the parking lights can light with the brake light out or vice versa. Pulling the tailight housing out is no big deal. There's a How-To on American Muscle for installing sequentials. Use that for a step-by-step on removing the housing. So easy even a caveman can do it.

 

thanks i will do that

 

Nuke do u have any idea why a bulb would start acting like it is out (interior turn signal light blinks fast and the bulb actually doesnt light up) then after any period of time it will work just fine for another month then do it again for an hour or two.

 

FWIW, there is no need to buy a new taillight bulb if one of them fails to illuminate either when the brake pedal is pressed or when the blinker signal is activated for that side, because all 6 taillight bulbs in both lenses are identical and interchangeable.

And one of the important features that makes them interchangeable is they all have 2 filaments(as noted by Nuke). One filament is low wattage that illuminates simultaneously on all 6 bulbs when either the headlights or parking lights are turned on. The other filament is high wattage that illuminates simultaneously on only 4 of the bulbs(2 middle and 2 outermost on each side) when the brake pedal is pressed, and illuminates simultaneously on only 2 bulbs on either side(middle and outermost) when the turn signal for that side is activated.

Hence, if turning on the parking lights or headlignts illuminates all 6 bulbs, but pressing the brake pedal or activating the blinker signal fails to illuminate either the middle or outermost bulb on either side, then just swap the burned out bulb with the innermost bulb from the same side. The bulb with the burned out high wattage filament will work as the innermost light since its low wattage filament is still good, and the innermost bulb should work as either the middle or outermost light since its low wattage filament is still good and its high wattage filament should also be good as it had never been previously used.

As you probably have already guessed, you will have to buy a new bulb if the low wattage filament burns out on any of them.

 

My 07 came factory with (2) 3156 and (4) 3157 bulbs.
So all 6 were not the same in my stang.
They are now that I have sequentials...


Your SJB is wet. Sorry....
Water leak detection time....

 

ok ill take a look at it this weekend thanks 157db

 

Apparently Ford either changed their taillight bulb specs for the GT sometime after my 05 was manufactured, or the specs are different for the V6's since all 6 of mine are definitely identical, and I believe the 3156 has only a single filament while the 3157 has dual filaments.
Either way I stand corrected, and edit my assumption in my previous post that the taillight bulbs are identical in all 2005 and newer Mustangs with the comment "Check that the taillight bulbs are identical before interchanging them".

 

Dirty connector? Dirty socket? Dirty bulb contact? Take your pick. Although rare, it wouldn't surprise me to have a filament blow and then bounce back and get stuck in place (IF it separated close to a connection point) until the next shock large enough to disconnect it. That's just a guess but I HAVE had house light bulbs, that were supposedly burned out, "blink" as I touched them to remove them from their sockets.