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Towing mirror running lights not working


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Hello everyone, I’ve been trying to figure out my running light issue for a few months now but haven’t gotten very far. I purchased a 2015 GMC Sierra 2500hd with the “new” style towing mirror already installed. Noticed when I got home that the lights on the front of the mirror (on both mirrors) were not illuminating with the running lights of the truck. My blinker light on the glass works as normal on both mirrors. Got curious one day & took one mirror apart. Did some research & found that the mirrors must be aftermarket because they do not use the torx bit screw for the shroud behind the glass instead they use a Phillips head screw. Everything was plugged in & looked normal. I have verified the lights on the front of the mirrors do work because when I unlock the truck with my fob they come on with the running lights, but when I actually start the truck they turn off. Any ideas would be greatly appreciated. Thanks! 

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I’m having the same problem. Does anyone know where to find the right harness or if I can just rig a jumper wire some where. I have a 17 Sierra and the marker lights work but as soon as I shift from park they turn off. 
I’m on the fence if switching out to power folding mirrors too but for now if there is a easy fix I would like to go ahead and do it.  

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On 7/8/2022 at 12:19 PM, MagicDragon252 said:

I’m having the same problem. Does anyone know where to find the right harness or if I can just rig a jumper wire some where. I have a 17 Sierra and the marker lights work but as soon as I shift from park they turn off. 
I’m on the fence if switching out to power folding mirrors too but for now if there is a easy fix I would like to go ahead and do it.  

This is certainly not what we like to hear, MagicDragon252.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 17 Sierra. To do so, please send an email to [email protected] with ATTN: MagicDragon252/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
Privacy Statement | General Motors
Your privacy is important to General Motors. This Privacy Statement addresses the personal information GM collects and how GM handles that personal information.
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On 10/7/2022 at 4:22 PM, taisjia said:

I have the same issue! The heaters work but the directionals and running lights do not.  We bought the truck this way.... 2015 2500hd silverado

 

 

Needs new door harnesses and depending on the build date of your 2015, the "RZY" harness.  Boost Auto Parts makes modification kits for all 3 of those.  

 

57 minutes ago, Jacob Soczynski said:

So I installed after market switchback tow mirrors on my Silverado and the blinkers come on but the dlr running lights dont. Wired them up to running lamp and another lamp and turn signal pin in the door but no running lights. Please help !!

 

 

Year?  Make?  Model?

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10 hours ago, Jacob Soczynski said:

2014 Chevy Silverado 1500 late model 2014 

 

 

You will need door harnesses if they haven't been changed or modified, and then the "RZY" harness.  

 

Both are linked below from Boost:

 

2014 - 2019 GM Plug and Play Tow Mirror Wiring Harness – Boost Auto Parts

 

RZY Harness for Plug and Play Tow Mirrors - Silverado & Sierra (2014 & – Boost Auto Parts

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I have a 2017 gmc sierra. I recently installed tow mirrors and every Works fine except on my driver side my running lights donts work. My passenger side no problem but driver no dlr. anyone have and ideas on whats going on? They have both been wired the exact same on both sides so im not sure whats going on.

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