Left Rear Running light not illuminated. I was told by Ford Service Rep. That I have to replace the entire unit, which I did still not lighting up, a

[Podaddy065]

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[CancunBadlands]

You must to.... there's not such a bulb replacement on that unit
#sorry

 

[Podaddy065]

You must to.... there's not such a bulb replacement on that unit
#sorry

I replaced it with a brand new set. Of taillights, I bought the pair and the left side still does not work.

 

[CancunBadlands]

did you check the fuse box?!

 

[Podaddy065]

Fuses all appear to be good...I have a mechanic willing to do diagnostic on it but 2-3 weeks away

 

[Glamdring70]

I don't know how strong your mechanical skills are, but, did you try putting a meter to the harness and seeing if the assembly is getting power?

Is the harness connector same left and right? Plug the working unit in and try it again. Don't install it, just plug it in and have someone hold it.

What fuse in which fuse box did you determine operates the lamp? Power is supplied by a state change in the BCM. So if the BCM fuse failed, neither lamp should operate. I agree probably not a fuse, but then either the splice point to the left lamp, or the lead to the ground point might be pinched or broken.

Is your sidemarker (rear) lamp on that side also nonfunctional? It could be a transistor failure in the BCM that just isn't turning on that supply. Weird but possible.

 

[Podaddy065]

Thank you so much for your reply. I am digging deeper as we speak.

 

[Tickover]

Ouch! Please let us know the outcome.

 

[PonyDriver43]

Aren't LEDs wonderful??
Watching this thread for sure.

 

[Ecom911]

Fuses all appear to be good...I have a mechanic willing to do diagnostic on it but 2-3 weeks away

I see you're in Thunder Bay, drop by Pinewood Ford, I'm sure they could find you an answer PDQ.

 

[CancunBadlands]

FORscan software could help!

 

[Quashish]

FORscan software could help!

How so?

 

[CancunBadlands]

FORScan is an OBD2 software scanner designed for Ford, Mazda, Lincoln, and Mercury vehicles. It's a free open-source program that allows users to interact with their vehicle's computer, read and clear diagnostic trouble codes (DTCs), and potentially change vehicle settings and parameters.

 

[Quashish]

FORScan is an OBD2 software scanner designed for Ford, Mazda, Lincoln, and Mercury vehicles. It's a free open-source program that allows users to interact with their vehicle's computer, read and clear diagnostic trouble codes (DTCs), and potentially change vehicle settings and parameters.

I know what it is, I've used it many times now. How would it help here in this situation?
OP's vehicle isn't throwing a cel

 

[Chiefthepup]

If it was me I’d take a multimeter to each of the wires at the plug your tail light plugs into.

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