The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-06-2018, 02:14 PM   #1
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Installing door wire boot/bellows

My truck did not come with power locks or power windows. I am going to drill the wire holes in the cab and the door, and install the rubber wire bellows.

I bought two new ones from LMC. One end of the bellows has a large opening, and the other end has a smaller opening. Does anyone know which side the larger opening goes to, the cab or the door?

I've been to the junkyard to try and check this out and investigate other aspects of the PL/PW conversion, and the closest vehicles I could find were a few 88-91 Suburbans. Unfortunately, the bellows is riveted in place. Can't really get a drill in there without removing the door.

Has anyone done this conversion before?
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-06-2018, 05:20 PM   #2
75C10
Registered User
 
Join Date: Oct 2014
Location: Calgary Alberta
Posts: 161
Re: Installing door wire boot/bellows

I have done this several times. Carefully remove the doors, drill the holes, feed the wires thru and then carefully reinstall the doors. Use screws to remount the conduits (bellows). Its not that hard with a 4x4 and a floor jack. I did mine by myself. Be careful and don't drop the door. Clean up sharp edges or you will have issues.
75C10 is offline   Reply With Quote
Old 03-06-2018, 05:38 PM   #3
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

Quote:
Originally Posted by 75C10 View Post
I have done this several times. Carefully remove the doors, drill the holes, feed the wires thru and then carefully reinstall the doors. Use screws to remount the conduits (bellows). Its not that hard with a 4x4 and a floor jack. I did mine by myself. Be careful and don't drop the door. Clean up sharp edges or you will have issues.
Do you remember which way the bellows were installed? One end has a big hole and one end has a small hole, not sure which end matches up to the cab.
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-06-2018, 05:46 PM   #4
75C10
Registered User
 
Join Date: Oct 2014
Location: Calgary Alberta
Posts: 161
Re: Installing door wire boot/bellows

I think the big end goes on the door pillar as the factory wire harness goes thru a big bend at this point. It comes down the inside of the door jamb from the top and bends kind of 90 degrees to go thru the conduit. I used a large hole saw in the jamb with a smaller hole saw on the door. File edges smooth. You can rivet it shut but it makes access harder if you have wire issues. This is common in the jamb.
75C10 is offline   Reply With Quote
Old 03-06-2018, 07:54 PM   #5
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

That makes sense, I'll go with that. Thanks.

Did you find that either the door or cab had dimple marks where to drill? I think I saw some on the door but I need to confirm that they match the hole spacing on the bellows.
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-06-2018, 08:14 PM   #6
75C10
Registered User
 
Join Date: Oct 2014
Location: Calgary Alberta
Posts: 161
Re: Installing door wire boot/bellows

Yes the locations are already marked in the door jamb and I think on the door as well. Thats a very good point.
75C10 is offline   Reply With Quote
Old 03-07-2018, 08:55 PM   #7
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

I took a closer look and some measurements of the dimpled drill points.

The dimples on the door are definitely right, the dimensions line up fine with the rubber bellows.

The marks on the cab are a little weird. There's four holes, and the two outer ones do line up with the rivet holes in the door boot. The two inner holes seem to be spaced evenly between them. Not sure why there would be 4 holes? unless it's because the cab wire hole is larger and they had some special way of cutting it?

Here's the door:


Here's the cab:


Do the cab dimples look like what you've seen before?
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-08-2018, 12:37 AM   #8
Dads79GMC
Senior Member
 
Dads79GMC's Avatar
 
Join Date: Feb 2008
Location: Des Moines, Iowa
Posts: 1,238
Re: Installing door wire boot/bellows

If you look inside the door, you'll see the same dimples! Not sure if the circle represents what size the actual hole should be.

Pictures:
1. Inner NOS door on my 79.
2. OEM door on the 78. Can't really see the dimples, but you can see the outline of the circle in both pictures.

Thanks Mike
Attached Images
  
__________________
Instagram @HomeBuiltC10s

Dads 79 GMC Build Thread
http://67-72chevytrucks.com/vboard/s...d.php?t=642929

1978 Silverado Build
http://67-72chevytrucks.com/vboard/s...d.php?t=756016
Dads79GMC is offline   Reply With Quote
Old 03-08-2018, 02:05 AM   #9
gmachinz
Account Suspended
 
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
Re: Installing door wire boot/bellows

You need to cut a 1.75” on the outside, then a 1.5” hole on the inside of the cab. I’ve done his quite a few times when converting from manual to power using my harnesses-it’s as close as you can get to how GM did it. I did my father in laws 77 GMC this way....
Attached Images
 
gmachinz is offline   Reply With Quote
Old 03-08-2018, 12:30 PM   #10
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

Thanks gmachinz, I was looking around that area wondering where wires would come through. Is the positioning of that hole critical or is it all open space within? On my drivers side plastic kick panel, it looks like there's a raised shroud for where the wires could come out and up but I'm not sure if that was the intended purpose, I'll get a picture later.

I did some measuring on the rubber bellows, looks like a 1.5 and 1.75 hole saw will be what I need, and I can use the 1.5 for the kick panel wire exit too.

Has anyone else seen 4 dimples on the cab door jamb area like I am seeing?

__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-08-2018, 03:43 PM   #11
75C10
Registered User
 
Join Date: Oct 2014
Location: Calgary Alberta
Posts: 161
Re: Installing door wire boot/bellows

Can't improve on whats been said. I can't remember if my door jambs had four dimples or not. But you are on the right track. Good luck.
75C10 is offline   Reply With Quote
Old 03-08-2018, 05:34 PM   #12
gmachinz
Account Suspended
 
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
Re: Installing door wire boot/bellows

Use the 1.75” on the outer first-when the bit goes just through to the inside panel-you’ll have a nice pilot hole to use the 1.5” from the cab interior side. I recommend drilling the 2nd dimple from the top-this way the wires go straight into the cab. Here’s my before pic:
Attached Images
 
gmachinz is offline   Reply With Quote
Old 03-08-2018, 05:35 PM   #13
gmachinz
Account Suspended
 
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
Re: Installing door wire boot/bellows

Make sure to ream both hole edges really good-the metal is pretty thick there.
gmachinz is offline   Reply With Quote
Old 03-08-2018, 08:57 PM   #14
Jaysonb
Registered User
 
Jaysonb's Avatar
 
Join Date: May 2009
Location: Good Thunder Mn.
Posts: 955
Re: Installing door wire boot/bellows

This is what the factory hole in the piller looks like,
Attached Images
 
Jaysonb is offline   Reply With Quote
Old 03-09-2018, 10:39 AM   #15
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

Excellent! Not sure what process they used to cut the hole at the factory, but the oval hole at least somewhat explains why there's 4 dimples in the cab instead of just three.

I think I can get away with center punching between the outer holes and then using a 1.75 hole saw.
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-09-2018, 10:49 AM   #16
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

The last detail is the kick panel hole. The location gmachinz posted seems lower than what the factory did, but probably makes it easier to route wires through the bellows. Maybe less strain on the wires too since they stay straighter

I found these pictures that show the wires coming out closer to the dash. It looks like GM placed the wires in the molded area in the kick panel cover where the fresh air vent pull handle would go.





I'm not sure if I can get the drill that close to the dash to cut the hole in the factory location.
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 03-14-2018, 02:05 PM   #17
Pyrotechnic
Registered User
 
Pyrotechnic's Avatar
 
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
Re: Installing door wire boot/bellows

Last weekend I took both doors off, cut the holes, and got the bellows installed on both sides. Thanks to everyone that contributed here. I still need to cut the kick panel holes, but once I do that I will start another thread as a how-to so that all the information contributed here and my experiences will be in one place and easy to find.
__________________
1977 GMC Sierra Grande
Pyrotechnic is offline   Reply With Quote
Old 04-10-2019, 10:44 AM   #18
blazer2007
Registered User
 
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
Re: Installing door wire boot/bellows

Did you ever start another thread ,I,m going to do this some time this year
blazer2007 is offline   Reply With Quote
Old 07-05-2019, 10:54 AM   #19
JHILDE
Registered User
 
JHILDE's Avatar
 
Join Date: Sep 2009
Location: Quitman, Texas
Posts: 52
Re: Installing door wire boot/bellows

Quote:
Originally Posted by Pyrotechnic View Post
Last weekend I took both doors off, cut the holes, and got the bellows installed on both sides. Thanks to everyone that contributed here. I still need to cut the kick panel holes, but once I do that I will start another thread as a how-to so that all the information contributed here and my experiences will be in one place and easy to find.
Interested in that thread.
JHILDE is offline   Reply With Quote
Old 07-05-2019, 03:42 PM   #20
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Re: Installing door wire boot/bellows

I'll be adding the bellows to my 85 this weekend. In fact, the parts are roaming my neighborhood on a FedEx truck as I type this. I'll try to document the process and post pics here as well.
SunSoaked is offline   Reply With Quote
Old 07-05-2019, 11:28 PM   #21
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Re: Installing door wire boot/bellows

I was able to grab this pic with my camera phone since I have the door stripped. You can clearly see the area that needs punched out for the bellows. My dimples weren't very noticeable on my door so I poked around with a 1/16th bit and then opened it up with a step bit. I'm going to install rivnuts instead of the rivets so I can easily remove the bellows when needed without having to drill out rivets in a door jamb. More to come tomorrow.
Attached Images
  
SunSoaked is offline   Reply With Quote
Old 07-06-2019, 12:47 AM   #22
gmachinz
Account Suspended
 
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
Re: Installing door wire boot/bellows

The factory had the luxury of using a shear punch to create a nice smooth oval-but on manual cabs this isnt an option-even using a step bit its a pita because there are 2 layers of metal to go through on the outer side and they arent welded together very well. You must seal the harness with a grommet on the inner kick surface which means the outer hole must must slightly larger so that a grommet can easily pass through. This means 2 things:

1.) Drilling straight through to keep the travel straight and:

2.) DO NOT use a step bit but instead a hole saw

I used a fine tooth hole saw to create a 1.75” on the outside and a 1.5” hole on the inside.
gmachinz is offline   Reply With Quote
Old 07-06-2019, 12:51 AM   #23
gmachinz
Account Suspended
 
Join Date: Jun 2011
Location: Des Moines, IA.
Posts: 4,143
Re: Installing door wire boot/bellows

Here’s what I came up with.
Attached Images
 
gmachinz is offline   Reply With Quote
Old 07-07-2019, 08:33 AM   #24
Hammered 77
Registered User
 
Hammered 77's Avatar
 
Join Date: Dec 2012
Location: Pendleton, Indiana
Posts: 235
Re: Installing door wire boot/bellows

gmachinz where did you find the rubber grommets for the inside?

Rick

Last edited by Hammered 77; 07-10-2019 at 06:09 AM.
Hammered 77 is offline   Reply With Quote
Old 07-09-2019, 04:00 PM   #25
RADustin
Registered User
 
Join Date: Jun 2017
Location: New Orleans
Posts: 386
Re: Installing door wire boot/bellows

what does the door to pillar gap look like?

I need to run wires in my '76 doors.
__________________
1949 Chevy 3100 P/U
http://67-72chevytrucks.com/vboard/s...d.php?t=302780

1976 GMC Sierra Classic C35 CCSB
http://67-72chevytrucks.com/vboard/s...25#post8188825
RADustin is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:10 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com