Topic: 1967 Hood Turn Signal Wiring Harness

[Paperback Writer]

I'm installing an Alloy Metal '67 hood turn signal lamp wiring harness, and I'm a little confused about where to attach the bracket (red circle in photo) and ground wire (yellow circle in photo) near the plug end of the harness...

In looking through dozens of photos I have of restored cars, I've seen these items attached to the firewall, the cowl, or even the hood itself.

Any guidance - and photos of correct cars similar to mine - would be most appreciated!

1967 SJ 390 Convertible, built in Sept. 1966

[midlife]

Isn't there a ground wire from the hood side of the cowl to the hood itself?  I'm not an expert, but I thought the harness routed along the cowl area above the firewall.

[Oz390]

On my '68 S convertible (San Jose Dec 67, so not a '67 but would think it would be similar if not the same?) they go to the firewall and hood.

[Oz390]

This is my 68 GT/CS, San Jose, April 68, different location... not sure which is "correct".  Or if it varied by plant/time....

[Oz390]

Just looked... '67 FAM shows it as in the first photo.  Again not sure if that is "correct" or not...

HTH

[ruppstang]

All grounds hooked to hood Dearborn cars ground below cowl and San Jose cars ground above cowl. I am not sure NJ. cars. Marty

[J_Speegle]

Not the smoking gun but maybe this set of pictures will help

All San Jose - unfortunately only one or so shows both the upper (hood) and lower (cowl) areas in the same shot. Plenty of hardware has detacted and tape fallen off the mounting clips

7Rxxx119xxx



7Rxxx139xxx



7Rxxx188xxx



7Rxxx189xxx



7Rxxx194xxx

[Paperback Writer]

Thanks all for your input - I think I've got it figured out now!

[67gtasanjose]

I'm installing an Alloy Metal '67 hood turn signal lamp wiring harness, and I'm a little confused about where to attach the bracket (red circle in photo) and ground wire (yellow circle in photo) near the plug end of the harness...

In looking through dozens of photos I have of restored cars, I've seen these items attached to the firewall, the cowl, or even the hood itself.

Any guidance - and photos of correct cars similar to mine - would be most appreciated!

1967 SJ 390 Convertible, built in Sept. 1966

Old thread, but I wished to try and connect some of these various discussions about these hood wiring differences
I am disappointed the Alloy Metal harness isn't MORE correct for the earlier 67's with the braided cloth covering. Has anybody found a reproduction suppier of the other versions of these harnesses?  Maybe Alloy Metals has another style available or can make it as a special order?

Richard

[67GT500]

Hi, what size screw holds the ground wire and plastic holder on the cowl. 5/16 or 3/8 ?

[196667Bob]

According to the 1967 Electrical Assembly Manual,both screws are No. 10, 16 threads per inch, pointed, self-tapping, hex, washer head screws, 3/8" long. The Standard and Utility Parts Catalog does not address the head size. However, the "Industry Standard" for No. 10 screws is 5/16" (in Jeff's pictures, these do appear to be 5/16").

Note also that the screw that holds the ground wire should have a No. 10 external lock washer under the ring connector.

According to the Assembly Manual, both the screws and lock washer should have a zinc dichromate finish. The Service Parts are shown with just a zinc finish.

Hope this helps.

Bob

[jwc66k]

Hi, what size screw holds the ground wire and plastic holder on the cowl. 5/16 or 3/8 ?

One screw grounds the harness to the hood, and a second holds the harness clip (377774-S). These are 42120-S36, documented in "Guide to Ford Fasteners - 1955-1973" by AMK Products. The flange around the head is 13/32, with a 5/16 inch drive. The screw to the firewall (cowl) that retains the harness clip and provides ground is 55378-S36. It is a machine screw, 10-24X1/2 hex head, and is used with a separate lock washer for the ground, also documented in the AMK guide. It has a the same head and drive measurement as 42120-S36. It is a unique screw only used on 67 Mustangs for the hood mounting ground and clip.
Note: It is possible that the assembly line used a tapping or self threading screw in this application.
Jim

[196667Bob]

One screw grounds the harness to the hood, and a second holds the harness clip (377774-S). These are 42120-S36, documented in "Guide to Ford Fasteners - 1955-1973" by AMK Products. The flange around the head is 13/32, with a 5/16 inch drive. The screw to the firewall (cowl) that retains the harness clip and provides ground is 55378-S36. It is a machine screw, 10-24X1/2 hex head, and is used with a separate lock washer for the ground, also documented in the AMK guide. It has a the same head and drive measurement as 42120-S36. It is a unique screw only used on 67 Mustangs for the hood mounting ground and clip.
Note: It is possible that the assembly line used a tapping or self threading screw in this application.
Jim

The 1967 Electrical Assembly Manual shows that both screws are the 42120-S36, and the Lock Washer is a 34939-S36.

Bob

[jwc66k]

The 1967 Electrical Assembly Manual shows that both screws are the 42120-S36, and the Lock Washer is a 34939-S36.
Bob

If that's true, what is item 10 used for?
Jim

[67gtasanjose]

If that's true, what is item 10 used for?
Jim

+1
We have seen a few differences in pictures posted throughout the site where the two "item #6's of the Osborne Electrical Assy Manual" are screwed in with one screw, instead of the two the AM shows ON THE HOOD SIDE.
We have also see several examples where screw #10 IS NOT USED EITHER. I have discussed these points, not in detail, but in other threads. I imagine there are several different "assemblyline versions" out there and good luck with running those down. All I got was mostly "crickets" when I brought this up before.