Got thr headlamp issue fixed now it seems i have a rear lamp issue. I have a running lamp in the driver rear brake lamp assembly. However, neither the turn nor brake portion function. Replaced with a new socket and bulb. Still no dice. All other lights are functioning as designed. Are these two items on individual circuits per side light the high and low beams are per side? At a loss right now.

 

What are you working on???

 

2001 expedition eddie bauer edition. Sorry.

 

Do you have a multi meter ? You checked fuse #20 under the hood fuse box and it was good ? Do the hazard flashers work on that side ? Nobody butchered the harness under the left tail light trying to install some aftermarket lights or anything right ?


-Mike

 

There is no single fuse that can cause one of the rear corner signals to not work. There isn't even an F20 in the under hood fusebox.

The problem is either the multi-function switch or the wiring from the MFS to the left rear corner. Nothing else can cause the described set of symptoms.

 

Which wire on the MFS powers the driver rear blinker/brake lamp illumination? Neither works when using the respective switch.

 

Sorry, I didn't see a 2001 Expedition listed in your trove of vehicles, so I'll post the page from my old long gone 2001 Expedition's Owners Manual showing the #20 fuse protecting the left rear stop lamp circuit ....

 

My treasure trove of vehicles is irrelevant, I use the appropriate FACTORY service manual in order to answer questions.

You'd better go back and re-read the description for F20 that you used in an attempt to justify your incorrect response and match it up to the OP's symptom

 

I think projectSHO89 is on to it, either the multifunction switch (blinker handle) or wiring between that and the tail light. That's the only place both brake lights and turn signals go together.

 

The signal comes out of the MFS on a light green/orange wire. Gain access to to and check it with a test lamp or meter before taking anything else apart. If there's no evidence of a signal there and also no evidence of a pushed, pulled, corroded, burned or otherwise damaged pin, replace the MFS.

If the signal was present there, you'll have to check the wiring harness going to the left rear of the truck. Start with the column if you have tilt steering. There's a connector that can get stretched with the wheel is tilted down.

Ironically, I noticed an error in the factory service manual in that it doesn't show fuses #19 & 20 which would be installed in vehicles with a specific option (probably most of them). I'll have to file that missing data in my errata file.

 

I don't think Mother Ford bo-booed the wiring diagram. Double check me here. It looks to me like the light green/orange wire out of the MFS goes to the left rear stop/turn lamp as stated. But the light green/orange wire also has a takeout that goes back to the BJB to feed fuse #20, which protects the left stop/turn circuit of the trailer connector.


Now I gotta go rest my head

 

It wasn't the wiring diagram itself, it was the fuse table in cell #11-4 (Sep 2003 edition of EVTM) that has an omission. Cells 90-5 and 95-2 have the correct circuit diagrams.

It wouldn't be the first time I've found errors and omissions in Ford's documentation...

 

Thank You for that.


Now waiting to here what 68f10059 found.

 

Sorry i have yet to be able to reply. I am venturing to the fuse idea. Have yet to get to it as it is a co-workers vehicle and not my own. When chasing the headlamp issue I specifically remember checking the MFS connectors. 2 wires had come a little loose and I reseated them. At that time the only issue was the low beams and fog lamps being inop which ended up being the jumpered connector in thr dash by the passenger airbag. Upon putting everything together I can remeber functioning turn signals on both sides as I checked operation before putting it all back together. Will likely check the fuse tomorrow and report back.

 

Waste of time, cannot cause your issue.

You need to do the inspection I already gave you.