weird rear turn signal problem on my 2016 gt

[jayk2k3]

so, when the car is off the rear turn signal works fine, but when the car is running the right turn signal is out of sync with the 3 lights in the housing, sometimes the outer light is brighter than the rest? a week ago I charging up the battery and did not disconnecting it from the car, did I mesh something up? I Tried resetting the computer and disconnecting the battery.

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[ORRadtech]

I don't have help for the signal problem. But I'd be very surprised if charging the battery, connected or not, caused any damage.

 

[junits15]

You’ve likely got a damaged light, when you say “out of sync” what does that mean?

 

[jayk2k3]

so when i say out of sync, I mean the middle light is late to turn on. so the 3 lights go like this 1-3-2, instead of 1-2-3. also sometimes the 3 light is just brighter for some reason

 

[jayk2k3]

is anything else could cause this beside a bad housing? it wierd because its fine when the car is off

 

[junits15]

Look for corrosion in the connectors, seems like an intermittent bad connection.

 

[Cobra Jet]

so, when the car is off the rear turn signal works fine, but when the car is running the right turn signal is out of sync with the 3 lights in the housing, sometimes the outer light is brighter than the rest? a week ago I charging up the battery and did not disconnecting it from the car, did I mesh something up? I Tried resetting the computer and disconnecting the battery.

See if this post helps:
https://www.mustang6g.com/forums/threads/tail-light-out-then-back-on.101551/page-6#post-4024945

 

[jayk2k3]

Cobra Jet thanks for posting this thread. I'm going to check tomorrow if I have 12 volt or more at the tail light house with the car running and off. Probably just need a housing just want to make sure be i spend the money.

 

[jayk2k3]

I read this could be a sign of a bad bcm? I just found out there's a module in the truck for the tail lights I believe? Anyone know more about this module FR3Z-13C788-D, can I just order one, or does it have to be program?

 

[Snakebyte]

I read this could be a sign of a bad bcm? I just found out there's a module in the truck for the tail lights I believe? Anyone know more about this module FR3Z-13C788-D, can I just order one, or does it have to be program?

Hope this link helps
https://modulemechanics.com/product/fr3z13c788d-control-module-oem-ford-mustang/

 

[GTP]

I had a similar symptom on my 2016 car.

IIRC there is an electronics board in the tail light itself which becomes intermittent. There might be a TSB about it. @Cobra Jet is the Oracle on such things.

 

[Cobra Jet]

I had a similar symptom on my 2016 car.

IIRC there is an electronics board in the tail light itself which becomes intermittent. There might be a TSB about it. @Cobra Jet is the Oracle on such things.

Thanks GTP!

LOL - sometimes I can’t find my own posts considering the years of material I’ve put on here…

Here’s the SSM - but this was from a while ago, still may apply:
https://www.mustang6g.com/forums/threads/tail-light-out-then-back-on.101551/page-2#post-2393882


Also to note:
I know there’s a board in each taillight housing and the BCM does have some type of controlling mechanism.

This thread may help you out, as I have never messed with Forscan (yet). The post is from a guy in Switzerland, but it sheds some really good info on the BCM and tail wiring.
https://www.mustang6g.com/forums/threads/disabled-sequential-turn-signals.120768/#post-2523035

This thread is from a guy in Germany, but the responses shed more light on the association of the taillight to the BCM.
https://www.mustang6g.com/forums/threads/programing-taillights-mustang-s550.118792/

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