ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1966 Mustang => Topic started by: 1966GTFB on March 21, 2014, 04:07:02 PM

Title: Firewall Hole locations and sizes
Post by: 1966GTFB on March 21, 2014, 04:07:02 PM

Help please.

I have an original early 66 GT FB SJ car mid Sept 65. The old Firewall was replaced and now I am trying to put it back together. It has a 65 washer pump 2 wire harness with the large grommet through the firewall but there is no hole for that to fit on the new FW. Photo attached.

1)What size should it be to fit the 65 harness? I had another look at the plug, it appears to be 3/4 does that sound correct? If anyone can confirm that would be appreciated.

2) Where does the Fog light feed come through the FW?

Any idea what the small hole up and left of the headlight harness is for?

Thanks everyone.

Jeff

Title: Re: Firewall Hole locations and sizes
Post by: Brian Conway on March 23, 2014, 04:29:58 PM

Hello Jeff;  Surprised the guys have not gotten to your questions.  My ride is a May 65 SJ car.  Couple of pics to get you going.  the GT/fog light wire is the smaller of the two and is a bullet connection.  The larger wire is for a alarm system.  Will be back with particulars later.  Brian

Title: Re: Firewall Hole locations and sizes
Post by: Brian Conway on March 23, 2014, 06:08:51 PM

Remember my car was delivered to the new owner on May 29, 1965 and scheduled for June 1.  My car does not have a windshield washer but I assumed the small hole was for that set up.  Took a picture of the area and there is another dimple there for something ?  The GT fog light wire hole is 7 1/2" down and 1 1/8" over.  Brian

Title: Re: Firewall Hole locations and sizes
Post by: 1966GTFB on March 23, 2014, 07:05:22 PM

Thanks Brian, The measurements are from the cowl I assume?

Jeff

Title: Re: Firewall Hole locations and sizes
Post by: Brian Conway on March 23, 2014, 07:29:39 PM

Yes.

Title: Re: Firewall Hole locations and sizes
Post by: 1966GTFB on March 23, 2014, 08:58:01 PM

Thanks again Brian, Can anyone confirm the wiper location and size. It looks to be ~3/4 straight above the headlight harness but how much above I wonder?

Jeff

Title: Re: Firewall Hole locations and sizes
Post by: J_Speegle on March 25, 2014, 12:06:05 AM

Quote from: Brian Conway on March 23, 2014, 04:29:58 PM

Hello Jeff;  Surprised the guys have not gotten to your questions.............

Been doing a bunch of car inspections, phone calls and writing reports this week 

To the request


Here are two pictures from that plant and period showing the holes and plugs and wires depending on application (GT or non GT)

(http://www.concoursmustang.com/forum/gallery/2/6-240314220243.jpeg)


(http://www.concoursmustang.com/forum/gallery/2/6-240314220205.jpeg)




Last picture is from a car much later in 66 around 159xxx. Hope this helps

(http://www.concoursmustang.com/forum/gallery/2/6-240314220313.jpeg)

Title: Re: Firewall Hole locations and sizes
Post by: 1966GTFB on March 25, 2014, 06:56:10 PM

Perfect, that is what I thought, Do you happen to know the size the Washer harness hole for '65 plug Jeff? I bet you do?

Thanks,

Jeff

Title: Re: Firewall Hole locations and sizes
Post by: J_Speegle on March 25, 2014, 09:44:53 PM

Quote from: 1966GTFB on March 25, 2014, 06:56:10 PM

Perfect, that is what I thought, Do you happen to know the size the Washer harness hole for '65 plug Jeff? I bet you do?

No 65's at home but can see if there is one or more 65's at the Resto Mod shop tomorrow- its shop day :)

Title: Re: Firewall Hole locations and sizes
Post by: jwc66k on March 26, 2014, 12:13:07 AM

Get all the cables in your possession that go thru the firewall, measure the "grip" on their grommets, then make the holes. That way the holes won't be too big.
Jim