The brake and turn signal lights on my 04 f150 quit working. I've replaced all of the fuses and relays I could find from the owners manual. The windows have also quite working. Does anyone have any idea what may be wrong?

 

front and rear ? I would check voltage at the light plug and brake switch and see that you have a good ground....... but could be the multi function switch itself.... brake and signal are the same light, with switch selecting one or the other.

 

it has a ground because the parking lights work. The turn signal clicker doesn't even light up at dash or make noise. Where would the multi function switch be?

 

Additional information needed.

1. Does the high-mount stop lamp work when the brake pedal is pressed?

2. Do the emergency flashers work, both front and rear, or only partially?


The window issue is separate from the exterior lighting problem.

 

I got the brake lights and signals working, but the trailer lights still don't work. Also the windows and radio don't work which I've read is the body module but I haven't figured out where it is yet.

 

What did you do to repair them?
Which ones? All or some? Factory towing package?

The BCM has nothing to do with either the power windows or the radio.

 

There was a blown fuse. Even though I had checked it twice my dad found it. The trailer brake and turn still don't work and then what controls the radio and Windows? I've read it's body or hec module

 

the trailer brake/ turn lights are a separate fuse from the truck light fuses.... and see that you have a good GROUND on the trailer. Is there a separate ground wire ( normally white) or does the trailer ground thru the hitch ?

 

trailer brakes fuse 36 & 42... but if BOTH sided are out, I would look at a GROUND.

see page 198- 200

http://www.fordservicecontent.com/Fo.../04f12og5e.pdf

 

Check the specific fuses already recommended. If the trailer's running lamps work properly, the ground for the trailer is fine.

Switches.

Then whatever you read was wrong.