Rear running lights

[Teugenis]

2008 Ford f 150 lariat .
Real lights (not brake lights ) stay in when truck is off ?
Just happened .. truck had been parked for almost a day .. than click they pop on . But not head lights ? Pulled headlight switch .. nothing they stay on? Also at same time turn will work .. sometimes ??

 

[jlee]

Turn signals will work sometimes but not always? You have some wiring troubles ahead of you.

 

[BonzaiDuck]

Just off the top of my head, and I'm not an auto wiring whiz -- so there's my disclaimer.

Before doing anything specific to the lights, please disconnect the negative terminal of your battery. Go fix yourself a sandwich and have lunch. Then reconnect the battery.

More specifically -- review all the procedures for resetting the onboard ECM/ECU engine control computer. Then -- follow through. Before anything, disconnecting the battery is likely to be an essential step.

Again -- I'm just making a guess. I've never owned a model and make as recent as the OP's. My car has a computer from the mid-90s, and there are advantages that it doesn't do things that more recent vehicles have done for at least a few years.

For instance, the voltage and/or amperage of my lights are not polled by the computer through a sensor to determine whether they've burned out or shorted out -- something that is likely reported on the dashboard idiot lights of newer cars. So I can integrate about 80% of my vehicle's lighting array with the latest LED replacement "bulbs" more easily than would be the case for a car model using halogens and incandescent as new as the last decade.

If the car is manufactured specifically with LED OEM specs, that is another different ballgame.

Back to the OP -- do you have the shop manual? Can you find the wiring diagrams for the light-sets specific to the symptoms? Have you made an inventory of malfunctions?

 

[mindless1]

I recommend better english, more information, and text formatting. If english is not your native language then post the question in an automotive forum that uses your native language.

 

[Teugenis]

2008 Ford f 150 lariat .
Real lights (not brake lights ) stay in when truck is off ?
Just happened .. truck had been parked for almost a day .. than click they pop on . But not head lights ? Pulled headlight switch .. nothing they stay on? Also at same time turn will work .. sometimes ??

Update ... New.multifunction switch installed ... Problem still there ..
Rear lights stay on always ..
Rt blinker just solid .. no blinking ..

 

[Teugenis]

I recommend better english, more information, and text formatting. If english is not your native language then post the question in an automotive forum that uses your native language.

Awesome 👍 thanks for the help .. not !

 

[mindless1]

It is help. You turned away people by not making more of an effort. I was merely the one that told you why.

I've been helping people with their ford truck and suv problems for many years and pretty much pass up topics were it looks like the person can't be bothered to do their share of the work fixing THEIR problem.

Your truck is not in front of us. Effective, easy to read communication is key in not annoying people when you want their help.

 

[Teugenis]

I recommend better english, more information, and text formatting. If english is not your native language then post the question in an automotive forum that uses your native language.

It is help. You turned away a lot of people by not making more of an effort. I was merely the one that told you why.

You don't seem to understand that only you can see the vehicle and it is not reasonable to expect people to make guesses and comprehensive posts about those guesses when they could be wrong due to your lack of clarify and information.

If they have to ask you questions to pull relevant info or put up with you not bothering to compose proper sentences, you didn't want it fixed very badly.

Think about it. When replies make more of an effort than you did on your own topic, it is very bad form.

I guarantee I could fix your problem if I had the vehicle in front of me but you trying to relay info is useless.

Understood I'll look elsewhere

 

[BoomerD]

https://www.f150forum.com/

some pretty good folks there.

 

[Teugenis]

https://www.f150forum.com/

some pretty good folks there.

Thanks I'll check it out

 

[BoomerD]

Thanks I'll check it out

I'm an f-150 owner. (2018) and have owned older ones as well...and I've never encounterd a problem quite like yours.
There are a few Ford techs that hang out on that site. With good explanations of the problem, they should be able to help get it sorted out.

 

[Teugenis]

I'm an f-150 owner. (2018) and have owned older ones as well...and I've never encounterd a problem quite like yours.
There are a few Ford techs that hang out on that site. With good explanations of the problem, they should be able to help get it sorted out.

I originally thought rear running lights .. but it's the breaklights .. although I can hit break pedal and they get brighter ..
Replaced brake light switch and multifunction switch ..
Only fuse that effects them is f36 trailer tow rt turn signal ..