H3T Light gremlins

[SWANK3T]

My brake lights on my 3T are intermittent and clearance lights don’t turn on at all. Running lights and turn signals all work fine, the fuses are good. If I keep my foot on the brake longer than a few seconds I get “TRAC FAILED SERVICE STAB SYS” I thought this may be related to the lights but it’s not lights work with code and sometimes don’t work without the code. Any ideas?

 

[theJARRETconcept]

Did you change / do anything with the electrical or is this happening out of the blue?

 

[SWANK3T]

Out of the blue.

 

[theJARRETconcept]

if your under warranty take it to the dealer, other wise i don't really know.
maybe you have a short somewhere?
a button sticking? (transfer case button)

but dealer if you still have the warranty.

 

[M22KLARS]

Have you ever had water problems in the cab?

 

[alrock]

Starting to think failing BCM, which falls along the lines of M22's water thoughts. Do you have a sunroof? Check for water leaks along passenger A pillar down to the kickplate where the BCM is located.

Also, just make sure your battery terminals are TIGHT. They should not spin at all.

 

[SWANK3T]

No water truck has been in So Cal its entire life only been in light rain / car washes. I do have a sun roof so Im going to check the a piller, BCM and Ill make sure the battery terminals are tight. Thanks fellas!

 

[f5moab]

If stock battery terminals, run up to a good parts store and get a good set of crimp on style (crimp onto the wire). Factory terminals are $hit.

But if not battery, and not water, chances are it is the BCM. So when checking the cables, at least disconnect the negative for a few seconds and re-attach and see if that clears it up. Sometimes a disconnect will clear up any intermittent, internal brain malfunctions (aka brain farts) in the BCM and other computers. If not, take it to the dealer for troubleshooting. First thing they will do is disconnect too, then reconnect and check battery cables. If that does not work, I would bet they will do a re-calibration on the BCM.

 

[SWANK3T]

F5 I do have stock terminals I will get new ones and Ill disconnect the negative to give that a go. Thank you.

 

[Steve #1]

Other than the clearance lights, the rest of it sounds like it could be the break switch.

 

[SWANK3T]

Steve that was what I was thinking if the battery stuff don't work I'll try the switch. Thank you for taking the time to answer.

 

[deserth3]

Electrical Gremlins... Start with battery terminals. While at store have them check charging system. That'll include battery.