Tow mirrors

[Sec]

Boys, I need help. 
 

I have a 2015 Durmax I believe that is the early version. I just got tow mirrors installed and everything is plug and play. But my running lights and flood lights don’t work. 
 

if I run a wire from parking lamps to the blue on it they will work but will eventually blow fuse. 
 

im trying to get them too work without paying an arm and leg with boot auto or whatever. 

[Spendit]

Contact pgamboa - he made harnesses for many on this site

[newdude]

22 hours ago, Sec said:

Boys, I need help. 
 

I have a 2015 Durmax I believe that is the early version. I just got tow mirrors installed and everything is plug and play. But my running lights and flood lights don’t work. 
 

if I run a wire from parking lamps to the blue on it they will work but will eventually blow fuse. 
 

im trying to get them too work without paying an arm and leg with boot auto or whatever. 

 

 

Did you install new door harnesses or get the Boost modify harness for the existing door harnesses?

 

If you did that already, early build 2015 need more wiring.  Called the "RZY" harness.  Your build date would be prior to August 2014 to need this for the lights to work.  GM sells it, Boost sells one.

 

 

[Sec]

No I haven’t, just got new mirrors from amazon the Sanooer ones.

 

i seen the harness but so expensive for that rofl

 

Is that the only way to do it or is there another way. 

[newdude]

On 6/4/2025 at 1:40 PM, Sec said:

No I haven’t, just got new mirrors from amazon the Sanooer ones.

 

i seen the harness but so expensive for that rofl

 

Is that the only way to do it or is there another way. 

 

 

You need the wiring in some fashion.  Either complete door harnesses or the Boost door harness modify harnesses and then if you are prior to some point in August 2014 you need either the GM RZY harness p/n 23387133 or Boost RZY harness.  

 

You can look at your build label in the glovebox for RPO code AVF.  If you do not see AVF, you are early build and need the RZY harness in addition to door harnesses.  If you see AVF on there, you just need the door harnesses.