Firewall bump?

[Offcamber]

Does anyone know what is behind the bump on the driver's side firewall that is behind the MC? There is a bump with what appears to be at least four spot welds. I need to drill a hole in the firewall to run a wiring harness and it would be a good spot to drill near the top left side of the bump.

 

[dta1984]

Hmm not sure, but can you run it through the firewall towards the bottom right where the factory harness is? I've removed one of the black "nipples" on the black boot and fed wires through it before.

 

[Offcamber]

I agree that running it through the firewall with the factory harness would probably be the easiest thing to do, but I'd have to open it up more than I'm comfortable with to run a plastic connector through it. Unfortunately, I'm not just running wire through it. That's my 'Plan B.'

The harness is going to be routed up along the A-pillar, so I'm open to additional suggestions for routing through the firewall and then up.

 

[Offcamber]

Any guesses? If not, I'll take a drill to it tonight. Or a sawzall. That should it.

 

[DisguisedRope]

I agree that running it through the firewall with the factory harness would probably be the easiest thing to do, but I'd have to open it up more than I'm comfortable with to run a plastic connector through it. Unfortunately, I'm not just running wire through it. That's my 'Plan B.'

The harness is going to be routed up along the A-pillar, so I'm open to additional suggestions for routing through the firewall and then up.

What kind of connector is it? Is it an option to cut it off and reattach it once the wire is on the other side of the firewall?

I wouldn't suggest just cutting into that hump without knowing whats behind it. It may be nothing, or it could be an expensive component that a drill would ruin. I feel like if there's nothing behind it, there wouldn't be that hump there in the first place. It's easier to leave the firewall flat and not put it there, so it must be purposefully built/placed to fit /guard something behind it.

 

[Offcamber]

What kind of connector is it? Is it an option to cut it off and reattach it once the wire is on the other side of the firewall?

I wouldn't suggest just cutting into that hump without knowing whats behind it. It may be nothing, or it could be an expensive component that a drill would ruin. I feel like if there's nothing behind it, there wouldn't be that hump there in the first place. It's easier to leave the firewall flat and not put it there, so it must be purposefully built/placed to fit /guard something behind it.

I was kidding about cutting into the hump itself, but I wanted to go through the firewall at one of the spot welds. I wasn't able to remove the connector (voids the warranty), so I decided to open up the hole to the left of the hump, added a larger grommet, and ran the harness through there. It worked well and it left just enough room to run some other wires through the hole. I didn't want to cut away too much of the sound deadening material on the passenger side of the firewall, so I never did figure out what that hump covers.

 

[DoorDing]

Use the spot welds as a guide to find the same area on the inside of the firewall. Most likely they are threaded posts on the inside with something attached to them...

 

[pjbrownva]

Any guesses? If not, I'll take a drill to it tonight. Or a sawzall. That should it.

I vote for the sawzall ... What ever it is can't be THAT important... op2:


I guess you used one of the round grommet holes and made it larger.
Some clear silicone caulk on the inside and outside might help if you want to seal it up a little more tightly, although I imagine that the firewall should stay pretty dry over-all.

There is soo much extra space HERE (see the red arrow),



that it's hard to imagine anything soooo big that you can't fit it through THAT hole. Plus, you can peel back the rubber cover some, which makes it easier to work with. For example, i have peeled it back and carefully used a box cutter to cut a small "plus" sign into the rubber, and then sharp wire cutters to snip off pieces to make a mostly-round hole slightly smaller than what I needed, which stretched tightly around my wire (and would do the same for a harness) when fed through. That with some silicone caulk, and you should be good-to-go!

Anyway... you've piqued our curiosity now. What are you installing? Police cruiser lights on the roof? A lidar system for self-navigation?
A light-up sign to give rude drivers the finger???!!!

The suspense is killing me. Pictures please!!!!

 

[97BlackAckCL]

Definitely don't cut or drill that spot, I don't know what's back there, but if they had to bump it out, chances are there's something important back there. I used the rubber grommet circled in blue right above ^

 

[Offcamber]

I vote for the sawzall ... What ever it is can't be THAT important... op2:

Anyway... you've piqued our curiosity now. What are you installing? Police cruiser lights on the roof? A lidar system for self-navigation?
A light-up sign to give rude drivers the finger???!!!

The suspense is killing me. Pictures please!!!!

When in doubt, ALWAYS use a sawzall.

The light up sign for rude drivers is a brilliant idea. I opted for a little holiday lighting project and needed to run all 15 of the plugs through the firewall.

The actual project was setting up a Switch Pros system and I needed to run the switch panel connector and harness through the firewall along with some wires from previous projects. Everything worked out well.

 

[pjbrownva]

When in doubt, ALWAYS use a sawzall.

Either that or a sledge hammer :brick:

I opted for a little holiday lighting project...

And I thought Disney world was fun! I love it!

The actual project was setting up a Switch Pros system...

Certainly you're kidding... We all KNOW it was for an electric heater for the dog carrier strapped to your roof...
:jaw:

After all, you wouldn't want your pooch to get cold while riding up there!



(Oh... wait... seamus on me... wrong election controversy... never mind!) :tape2:

I hope that I can MITT-igate any damage i've done or offense I may have caused! :dancin: