brake light issue

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Sep 7, 2017 | 06:40 PM

V10man

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From: Mesa

brake light issue

I recently discovered that my brake lights were not working. The high mount is. With a little research I came to the conclusion the switch was bad. I checked every fuse that had brake in the title. All good. So I buy a NAPA switch and swap it out. Still no brake lights and now high mount is not working. To check, I reinstalled the old switch. Still nothing. What now and why would the center mount stop working?

Sep 7, 2017 | 11:24 PM

V10man

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From: Mesa

After more reading, I went out and wiggled the multi switch(turn signal/wiper) and the lights came on. Anyone replace one of these?

Sep 11, 2017 | 04:40 PM

D.Yaros

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From: SE WI

Am I to understand that the turnsignal/wiper switch/lever is tied into the brake lights? That would come as a surprise to me, but then my 2002 F-250 SD, XLT V10 is my first Ford vehicle ever.

Sep 11, 2017 | 04:55 PM

seville009

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Quote:

Originally Posted by V10man

After more reading, I went out and wiggled the multi switch(turn signal/wiper) and the lights came on. Anyone replace one of these?

I replaced the multi function switch on my 2011; was easy - few screws hold it in.

Sep 11, 2017 | 06:14 PM

ligito

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From: Oregon

Quote:

Originally Posted by D.Yaros

Am I to understand that the turnsignal/wiper switch/lever is tied into the brake lights? That would come as a surprise to me, but then my 2002 F-250 SD, XLT V10 is my first Ford vehicle ever.

It also controls Hazard and turn signal lights.

Sep 11, 2017 | 06:32 PM

projectSHO89

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From: St Louis

Quote:

Originally Posted by seville009

I replaced the multi function switch on my 2011; was easy - few screws hold it in.

The functioning of the switch on a 2011 is VERY different than on the previous trucks. The MFS is simply an input to a computer module on the steering column which reads the operator's actions based on switch actuation, then sends that as a command (or request) over the network to the body control module which actually executes the desired operation by turning lights on or off.

Quote:

Am I to understand that the turnsignal/wiper switch/lever is tied into the brake lights? That would come as a surprise to me, but then my 2002 F-250 SD, XLT V10 is my first Ford vehicle ever.

On this era of truck, the rear brake lamp signal must go through the MFS so that the functioning of the turn signals and brake lights is done correctly. The HMSL signal is fed off the brake light switch before the MFS so it's possible (and not uncommon) for it to operate but the corners do not when the pedal is applied.