One taillight is brighter than the others - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 12-05-2016 Thread Starter
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One taillight is brighter than the others

So I realized that one or my tail lights was brighter than the others, and my third break light was broken so I replaced the bulb for that (now it works) however the taillight problem is still there. Another side note is that when I hold the breaks, the taillight goes back to normal intensity.

What's wrong and how can I fix it?

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post #2 of 5 (permalink) Old 12-06-2016
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Check all of the ground wires first. A bad ground will cause odd problems.


2002 Mustang 3.8L 5 speed 3.27 Trac Lock
2007 Mustang 4.0L 5 speed 3.31 Trac Lock -SOLD
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post #3 of 5 (permalink) Old 12-06-2016 Thread Starter
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Do you know where that is located?
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post #4 of 5 (permalink) Old 12-06-2016
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There is probably more than one ground for the tail lights. Trace the wires from the bulb back to the body. The ground wire will almost always be black. Check for broken wire or loose connections.

2002 Mustang 3.8L 5 speed 3.27 Trac Lock
2007 Mustang 4.0L 5 speed 3.31 Trac Lock -SOLD
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post #5 of 5 (permalink) Old 12-08-2016
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You don't state what year your car is ??

Possibly a 2010 ?

I don't know if it is wired same as 2005-2009...possibly so.

2005- 2009 cars work this way:

All six bulbs are two filament.
Innermost two bulbs (towards center of car), though each bulb is two filament, only one filament is used. There is no brake light or turn signal light from these innermost bulbs.
Only the running light (dim filament) is used. Don't know why Ford did this, but true. So on these innermost sockets there are just two wires each, one for power to running light and one from ground.

You might check to see that all bulbs are correct, all bulbs working in some fashion, not an incorrect bulb used for any one socket, and no one has changed wiring for any one socket. And sockets, all 6, are put into the proper places within the tailamp/brake lamp assemblies.
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