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99' F150 5.4L

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  #1  
Old 08-22-2011, 04:32 PM
Okcdiscgolfer
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99' F150 5.4L

I do not have brake lights.
The brake light over the cab is working but the tail lights (brake lights) are not working.

Where do I start looking for the problem?
Tail lights work and so do turn signals.

Thanks,
 
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Old 08-22-2011, 05:15 PM
projectSHO89
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MFS or one of its connectors, usually.
 
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Old 08-23-2011, 08:29 PM
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Hey from southwest okc. Have you checked all the fuses under the hood?? Might also look at the connectors under the bed and also make sure your trailer harness isn't shorting out somehow. Have you looked at the bulbs??
 
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Old 08-23-2011, 09:49 PM
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im guessing the brake light and turn signals use the same filament in the bulb.. THe main switch (turn signal) on the steering column selects which function goes to the bulb.. projectSHO99 said MFS = multi function switch..
 
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Old 08-24-2011, 06:58 AM
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Even the brake lights?
 
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Old 08-24-2011, 07:16 AM
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Yes, the stop lamps go through the MFS. The HMSL does not.
 
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