Size of hole in roof for rooftop lightbar?

This section is for discussion of OEM police package options and police equipment for the Caprice (both OEM and after-market), as well as after-market upfitting perfomed on our cars.
Post Reply
CrashTestDummy
Posts: 1723
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Size of hole in roof for rooftop lightbar?

Post by CrashTestDummy » Thu May 26, 2016 9:41 pm

Does anyone know, or can anyone measure the hole cut in the roof for the rooftop lightbar? We have a plug in ours, and I'd like to make sure I can cover it when I pull that plug. I'm actually contemplating getting a working GPS antenna for that spot, for any potential future use, so also want to make sure I don't get something too small, or too large. I got an old, used GPS pancake antenna from Garner, but am really thinking that if I'm up in there, I might as well snake some coax down the B-pillar, too. Just a thought. The old antenna was for the price of shipping, a new antenna is some $$.

Thanks.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

smwalker
Posts: 1393
Joined: Mon Jul 29, 2013 6:44 am
Location: Azusa,CA
Contact:

Re: Size of hole in roof for rooftop lightbar?

Post by smwalker » Thu May 26, 2016 11:56 pm

Do you think those are a standard size? Or did every upfitter use what ever size they wanted/needed?
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

User avatar
elc32955
System Manager
Posts: 1791
Joined: Thu Nov 29, 2012 4:32 pm
Location: East Central Florida
Contact:

Re: Size of hole in roof for rooftop lightbar?

Post by elc32955 » Fri May 27, 2016 12:37 am

It greatly varies depending on what tools the installer had handy at the moment. No easy way out of that one I'm afraid, your cable hole is individual to your car. Sorry.... I've seen installers use antenna hole saws, cable hole saws with different diameter, you name it. If the blade gets dull on saw "A" they just switch to different diameter saw "B" and grab escutcheon "B" instead of "A" for the remainder of the installs for the day.

Ever seen an equipment install that prison inmates did? :) Heh heh....
System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.

CrashTestDummy
Posts: 1723
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: Size of hole in roof for rooftop lightbar?

Post by CrashTestDummy » Fri May 27, 2016 4:14 am

Okay, the 94-96 B-body cars had a standard hole with a harness pulled through it from the assembly plant. I figured it would still be a standard. My bad.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

CrashTestDummy
Posts: 1723
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: Size of hole in roof for rooftop lightbar?

Post by CrashTestDummy » Thu Mar 09, 2017 11:58 pm

I used a large washer to back up the mounting nut on a GPS antenna. Everything went together fine.

And yeah, the hole was pretty narly-looking. Probably drilled with a hole saw that was way past it's prime.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

BIG_GREEK
Posts: 172
Joined: Mon Sep 12, 2016 5:18 am
Location: Delmarva

Re: Size of hole in roof for rooftop lightbar?

Post by BIG_GREEK » Fri Mar 10, 2017 1:07 am

yea it all depends. If the hole comes from the manufacture (Factory option), its most likely 3/4"-1". It can vary depending on what lightbar was used, what the moron was thinking whilst doing it, etc...

If in doubt, pull the plug, measure the hole and reinstall plug with silicone sealer.
"God created Police Officers so Fireman could have heroes!" - My late Father

2014 Phatom Black 9C1 (Toy)
2000 VW Jetta TDI (Daily 420k miles)

CrashTestDummy
Posts: 1723
Joined: Sat Feb 07, 2015 8:31 pm
Location: Pearland, Texas

Re: Size of hole in roof for rooftop lightbar?

Post by CrashTestDummy » Mon Apr 03, 2017 6:56 pm

IIRC, it was about 1" in diameter. A large flat washer served well to back up the nut on the inside.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?

StevenJay
Posts: 35
Joined: Sun Oct 29, 2017 3:43 am
Location: Lake County Illinois

Re: Size of hole in roof for rooftop lightbar?

Post by StevenJay » Thu Jul 05, 2018 11:36 pm

Measure it, but standard is 1 inch
Steven J.
-2014 Chevy Caprice PPV-Switchblade silver metallic(my car)-purchased 11/2017 @1200 miles from Burbank, IL
-2017 Chevy Caprice PPV- Switchblade silver metallic(Dad's car) purchased 1/2018 @ 500 miles from New York

StevenJay
Posts: 35
Joined: Sun Oct 29, 2017 3:43 am
Location: Lake County Illinois

Re: Size of hole in roof for rooftop lightbar?

Post by StevenJay » Thu Jul 05, 2018 11:41 pm

If it was a lightbar hole upfitters will just drill a 1 inch hole, install a rubber 1 inch thin wall grommet and run the wire bundle through the hole and silicone it .
Steven J.
-2014 Chevy Caprice PPV-Switchblade silver metallic(my car)-purchased 11/2017 @1200 miles from Burbank, IL
-2017 Chevy Caprice PPV- Switchblade silver metallic(Dad's car) purchased 1/2018 @ 500 miles from New York

Post Reply