Infamous brake light situation...
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New User
Joined: Nov 2018
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From: Ct
Infamous brake light situation...
Ok...my 04 F250 does not have any functioning brake lights. All three are out..I replaced the brake light switch under the pedal and still I have no lights. I checked the fuses under the dash, not sure if there any hiding elsewhere. The fuses were all okay. I have turn signals, four ways, and cargo light working properly...Now I'm lost..any advice I'll gladly accept
CT
CT
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Joined: Sep 2016
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I had this happen on another model vehicle. I did some troubleshooting and suspected a faulty relay. I still had the problem after replacing the relay... What!
After going through a lot of additional troubleshooting, I came back to the replay again. This just didn't make sense.
Okay... Here goes.. I replaced the relay a second time... Whallah... That did it.. The first replacement replay was also bad (Maybe infant mortality).. Gee Wiz...
Well, it never failed again after the third... Original -> First Replacement -> Second replacement (Qty 3)
After going through a lot of additional troubleshooting, I came back to the replay again. This just didn't make sense.
Okay... Here goes.. I replaced the relay a second time... Whallah... That did it.. The first replacement replay was also bad (Maybe infant mortality).. Gee Wiz...
Well, it never failed again after the third... Original -> First Replacement -> Second replacement (Qty 3)
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New User
Joined: Nov 2018
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From: Ct
I have this really expensive multimeter...but of course, I dont know how to use it properly..I tried to test the wire harness but I got no readings...my battery though is at 12.367v
Where is the relay located that controls the light?
The switch replacement is not OEM...Its from OReilys, mdc brand or something.
thanks again for the help
Where is the relay located that controls the light?
The switch replacement is not OEM...Its from OReilys, mdc brand or something.
thanks again for the help
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Joined: Jan 2004
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From: St Louis
Where is the relay located that controls the light?
Do you have an aftermarket brake system controller installed?
Did you verify with your meter that fuse F18 under the dash was passing power? If the hazards work, then F18 should be good.
Did you verify that the stop lamp switch was making and breaking as the pedal was pushed and released?
Did you check to see if you have power on the LG/RD wire at the switch (supplied via fuse F18)
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Postmaster
Joined: Nov 2015
Posts: 4,807
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From: Colorado Springs
I have this really expensive multimeter...but of course, I dont know how to use it properly..I tried to test the wire harness but I got no readings...my battery though is at 12.367v
Where is the relay located that controls the light?
The switch replacement is not OEM...Its from OReilys, mdc brand or something.
thanks again for the help
Where is the relay located that controls the light?
The switch replacement is not OEM...Its from OReilys, mdc brand or something.
thanks again for the help
Thread Starter
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New User
Joined: Nov 2018
Posts: 24
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From: Ct
There isn't one so it's going to be a lot harder to find than was suggested.
Do you have an aftermarket brake system controller installed?
Did you verify with your meter that fuse F18 under the dash was passing power? If the hazards work, then F18 should be good.
Did you verify that the stop lamp switch was making and breaking as the pedal was pushed and released?
Did you check to see if you have power on the LG/RD wire at the switch (supplied via fuse F18)
Do you have an aftermarket brake system controller installed?
Did you verify with your meter that fuse F18 under the dash was passing power? If the hazards work, then F18 should be good.
Did you verify that the stop lamp switch was making and breaking as the pedal was pushed and released?
Did you check to see if you have power on the LG/RD wire at the switch (supplied via fuse F18)
I did not verify F18 with the meter. My hazards do work.
Im not sure what 'stop lamp switch' refers to...is that the switch on the pedal. If so then yes, auditory reference. I could hear it click.
I did not verify power at the harness point. I can't tell if the wire entering the harness are properly secured...i would like to remove the harness and look at on the bench...but the only way would be to cut the harness out.
thank you all again
Thread Starter
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New User
Joined: Nov 2018
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From: Ct
I'm asking because I don't know...is the red wire the hot one your referencing
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
Other than the brake light switch from Oreliys, I can't say if the truck has an other aftermarket components. It a new truck to me.
I did not verify F18 with the meter. My hazards do work.
Im not sure what 'stop lamp switch' refers to...is that the switch on the pedal. If so then yes, auditory reference. I could hear it click.
I did not verify power at the harness point. I can't tell if the wire entering the harness are properly secured...i would like to remove the harness and look at on the bench...but the only way would be to cut the harness out.
thank you all again
I did not verify F18 with the meter. My hazards do work.
Im not sure what 'stop lamp switch' refers to...is that the switch on the pedal. If so then yes, auditory reference. I could hear it click.
I did not verify power at the harness point. I can't tell if the wire entering the harness are properly secured...i would like to remove the harness and look at on the bench...but the only way would be to cut the harness out.
thank you all again