Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

So I’m sure this has been covered before but I have been unable to find any real info, I have a 2017 Silverado 1500 crew cab lt, I bought a used topper, cap, finally got around to do wiring, done light was easy as I already had run a 12v power socket to the rear, wide up the 3rd brake light( with wife’s help and my volt meter) found the brake light power at the trailer plug harness, of coarse I didn’t do the research before hand because all you need is power when brakes are activated right! Well my brake light works but I now have found out that it is combined with the directional wire also, my question is.. is there a wire that is strictly brake? Where? Thanks in advance

 

 

Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

Toy should find everything at the trailer plug.

Sent from my SM-N960U using Tapatalk

Share this post


Link to post
Share on other sites
Toy should find everything at the trailer plug.

Sent from my SM-N960U using Tapatalk




From what I have been able to find out is that somewhere along the line the directionals and brake light combine, brakeleft turn/ brake right turn


Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

But not at the brake plug it is. Seperate for the trailer.
See image.06936bb465edc26f6b4c8397ff57f5f8.jpg

Sent from my SM-N960U using Tapatalk

Share this post


Link to post
Share on other sites

Hmm may need brake input from inside the cab or at rear controller

Sent from my SM-N960U using Tapatalk

Share this post


Link to post
Share on other sites

I geuss I’m surprised nobody has any information


Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

You could tap into fuse F38ua in the underhood fuse block. That is the fuse for the high mount stop lamp. It is "hot" only with brake apply.

  • Like 1

Share this post


Link to post
Share on other sites

Maybe splice into the brake wire to one of the tail light assemblies?  They have a separate brake-only signal that should do the job for you.

Share this post


Link to post
Share on other sites
Maybe splice into the brake wire to one of the tail light assemblies?  They have a separate brake-only signal that should do the job for you.


Where is the “brake only” signal in the tail lights? I Only have a left/stop and right/stop, blinkers are combined with brakes


Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites
You could tap into fuse F38ua in the underhood fuse block. That is the fuse for the high mount stop lamp. It is "hot" only with brake apply.



Thank you, is that the only place for that signal?


Sent from my iPhone using Tapatalk

Share this post


Link to post
Share on other sites

No, just the easiest.

Share this post


Link to post
Share on other sites

I just wired up one of my many boat trailers and there was running lights and turn it used the turn lamp for brake. But I have to think there is a brake wire at the rear body control module by the spare tire. Ever see how.may wires are on that thing? Good god.

Sent from my SM-N960U using Tapatalk

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.