Convenient place for firewall hole for wiring

[Whiz]

FIRST QUESTION - 2019 Silverado 4x4:  Am attempting, fruitlessly, to find an accessible hole in the firewall on 2019 Silverado 4x4, or to locate a convenient drill spot/hole punch location in the firewall to run electrical,  2-way radio wire, etc.

 

These 2019’s engines sit quite a bit further back and the firewall is not easily accessible.

 

Would be nice if GM would consider this and have a plugged hole to access.

 

SECOND QUESTION - 2019 Silverado 4x4:   Anyone having an issue with the tailgate popping back up about 5"-6" when it is dropped down?

[Chevor]

Someone posted on another forum the easiest spot to run outta cab is where the emergency brake cable enters, on the floor right below the accererator pedal.

 

Then you'll have to fish it up from below the carpet to where the carpet ends behind the pedal.

Edited August 17, 2019 by Chevor

[Mountain boy]

Look right behind the battery on the firewall there is a nipple right next to where all the cables go through on the passenger side, clip the end off the nipple goes right through and comes out on the passenger side. That’s where GM has you run the power wire for the sub.

[Smoothbassman]

Look right behind the battery on the firewall there is a nipple right next to where all the cables go through on the passenger side, clip the end off the nipple goes right through and comes out on the passenger side. That’s where GM has you run the power wire for the sub.

Did this spot work for you? I'm installing led lights this weekend looking for a clean spot to fish the control wires thru.

Sent from my SM-N960U1 using Tapatalk

[Sjordan]

On 8/17/2019 at 3:36 PM, Chevor said:

Someone posted on another forum the easiest spot to run outta cab is where the emergency brake cable enters, on the floor right below the accererator pedal.

 

Then you'll have to fish it up from below the carpet to where the carpet ends behind the pedal.

I would not recommend running anything near the accelerator. I always go passenger side if possible

[Whiz]

The firewall access portal hole (2019 Silverado Dual Cab 4x4) behind the battery is the same size as the one on the driver's side just left (facing firewall) near the steering column.  I have used both.  They are handy and easily sealed to the elements.

 

I am attempting to run an RG58 cable through the firewall for my 2-way radio, and a couple other smaller wires and really did not want to cut off the radio connector.   I can, but running the RG58 leaves no room for other wires. Both the above holes are just fine... for smaller wiring sizes.  I will most likely Greenlee punch a 3/4" diameter hole just left of the  steering column aera and just left and below the existing pass-through area provided.

 

I did route the previous antenna RG58 antenna cable around the front of the driver's door, and have to redo it because we've gone to a different 2-way.  I am using a hood side mount antenna base.

 

My comments were really directed to the folks at GM; to simply provide a plugged hole, perhaps 3/4" i- 1" in diameter for future use.  We used to up-fit law enforcement vehicles and sometimes it was a big PITA to run several large diameter wires through those firewalls.

 

Thanks for all the responses.  THey are appreciated.

[Meansse]

I have a 2021 Silverado 1500 duramax and I have tried both driver and passenger side cutting off that nipple, which allowed me to fish one small 14awg wire through, but could not find on the cab side.  No idea where it is going, but nowhere I can access.  I purchased a light bar harness and need a decent size hole to fit the connector through.  I do see a little room near the emergency brake cable, but not any room to drill and not much clearance on engine compartment side.  Why is this such a hard task?  I’ve spent a lot of time trying to get wires through and hoping I haven’t nicked any wires on either side where those bundles go through.  Thanks for any advice.  

[Transient]

I have a 2021 Silverado 1500 duramax and I have tried both driver and passenger side cutting off that nipple, which allowed me to fish one small 14awg wire through, but could not find on the cab side.  No idea where it is going, but nowhere I can access.  I purchased a light bar harness and need a decent size hole to fit the connector through.  I do see a little room near the emergency brake cable, but not any room to drill and not much clearance on engine compartment side.  Why is this such a hard task?  I’ve spent a lot of time trying to get wires through and hoping I haven’t nicked any wires on either side where those bundles go through.  Thanks for any advice.  

The interior side of the firewall hole on the driver's side has foam insulation covering it. You need to reach up high behind the brake peddle on the right side of the foam to find the wire once you've inserted it through the firewall. This allows you to run the wires up in the dash high enough to not interfere with operation of the peddles.

Sent from my SM-N960U using Tapatalk