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Ford F-150: Brake lights don't light up when I..pedal..mount

I have a Ford F-150...
I have a Ford F-150 2002. Brake lights don't light up when I press the brake petal. The high mount light does light up. I replaced hte bulbs on the back lights, and they work in the blinker, hazard, and when I turn my lights on. I believe it is the fuse tied to the lower brakes, but the owner's manual and my Haynes book doesn't give me a clean cut answer to which fuse it is (or if it is under the hood or in the cab fuse box). I don't think it is the BOO switch since the high mount like works when I press the brake petal. Any ideas?
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Answered in 7 minutes by:
8/19/2010
Ford Mechanic: lostrider, Ford Technician replied 12 years ago
lostrider
lostrider, Ford Technician
Category: Ford
Satisfied Customers: 3,075
Experience: ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
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Hi this is lostrider, your correct its not the BOO, the 3rd brake light is hardwired to the Boo switch, but the bottom 2 lights take a detour through the multifunction switch(Turn signal switch) before they run to the rear, thats where the problem is gonna be, you need to pull the steering column covers and take a look at the harness connectors for the switch and if all the terminals are in the connector then you will have to replace the switch assembly. here are the parts information, hope this helps.

Parts Information
PartOEM PartPrice
Turn Signal Switch
Multifunction SwitchYL3Z13K359ABA$166.53

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Customer reply replied 12 years ago
So you are saying you don't believe this is simple fuse issue, but the Multi-Function Switch (I see that box on the exterior lighting system diagram). Also, I notice that my license plate lights don't work.... I looked at the wiring diagram and it looks like it is on the same wiring run, but I haven't seen whether these might of been burned out, so I need to check them. Thank you for your answers and I'll be accepting your answer.
Ford Mechanic: lostrider, Ford Technician replied 12 years ago
We have replaced allot of these switches for this concern, and the fuse powers the brake light switch and its working, and there's no fuse in the circuit from the switch to the brake lights, now the licence lights is probly just a bad bulb, they work off the running lights and if there working then the circuit is good, hope this helps.
lostrider
lostrider, Ford Technician
Category: Ford
Satisfied Customers: 3,075
Experience: ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.
Verified
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lostrider
lostrider
lostrider, Ford Technician
Category: Ford
Satisfied Customers: 3,075
3,075 Satisfied Customers
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