Help AC Car Pass Side Horn Mount

[Kirk M.]

Hey Guys,

On an AC car the PS horn is mounted into a bracket in the fiberglass of the wheel well. Is there suppose to be a ground wire used, because I can't see how the horn grounds itself in that position. Thanks.

Kirk

[John H.]

Re: Help AC Car Pass Side Horn Mount

Hey Guys,

On an AC car the PS horn is mounted into a bracket in the fiberglass of the wheel well. Is there suppose to be a ground wire used, because I can't see how the horn grounds itself in that position. Thanks.

Kirk

Yes, there was a separate ground wire for the passenger side horn on an A/C car - see your A.I.M., section C60, sheet B1, item #9, 6289421 wire asm - ground. See photo below.

[Scott S.]

Re: Help AC Car Pass Side Horn Mount

Hey Guys,

On an AC car the PS horn is mounted into a bracket in the fiberglass of the wheel well. Is there suppose to be a ground wire used, because I can't see how the horn grounds itself in that position. Thanks.

Kirk

Kirk,

See the '67 AIM, UPC C60-B1, Item 9, 6289421 Wire Asm. - Ground

It appears to attach at the horn immediately underneath the passenger side GM 122007 horn mounting bolt. The other end of the ground wire attaches with Item 3, 3848320 Screw, which is the same screw asm. used on the body-mount access covers in the rear wheel wells.

Hard to tell from the AIM exactly where the upper end of the ground wire attaches. Seems to disappear into a .152-.156" diameter hole somewhere in or around the RH inner fender skirt.

[Scott S.]

Re: Help AC Car Pass Side Horn Mount

Guess I shoulda refreshed my browser before posting...

[Al R.]

Re: Help AC Car Pass Side Horn Mount

Kirk the upper end of the ground wire attaches to the radiator support near where the refrigerate (or is it the oil cooler lines) pass thru the support .There should be a small hole where the bolt screws into the support in this area. It's the only hole there that's small enough to accommendate the the bolt. Hope this helps. Al

[Kirk M.]

Re: Help AC Car Pass Side Horn Mount

Kirk the upper end of the ground wire attaches to the radiator support near where the refrigerate (or is it the oil cooler lines) pass thru the support .There should be a small hole where the bolt screws into the support in this area. It's the only hole there that's small enough to accommendate the the bolt. Hope this helps. Al

Is it possible to get a picture of that hole from you or someone?

Kirk

[Kirk M.]

Re: Help AC Car Pass Side Horn Mount

Yes, there was a separate ground wire for the passenger side horn on an A/C car - see your A.I.M., section C60, sheet B1, item #9, 6289421 wire asm - ground. See photo below.

John,

Is there suppose to be a star washer used in this case on either end?

Kirk

[Curtis M.]

Re: Help AC Car Pass Side Horn Mount

Guys,

If that ground wiring is missing, would the horn work? I assume not. I've been chasing a ground issue with my horns and felt it was somewhere in the steering column. After seeing this, I believe this may be where my problem is. I don't think I have this ground on my PS horn, also an AC car.

Thanks

[Scott S.]

Re: Help AC Car Pass Side Horn Mount

John,

Is there suppose to be a star washer used in this case on either end?

Kirk

Kirk,

According to the AIM, there is a separate star washer (GM 138485, Item 10) at the horn attaching bolt. The other end (to the radiator support) uses the screw assembly (GM 3848320, C60-B1, Item 3) that is the same as the body mount access cover screw. That screw has an attached star washer.

[Peter L.]

Re: Help AC Car Pass Side Horn Mount

Kirk - No picture, but referencing UPC C60, B1 drawing the hole for the 9420151 SCREW (#7) on our 67 C60 Corvette is located ~1/2" below the grommet hole for the lower metal refrigerant line on the SUPPORT ASM. The screw head is 5/16" and head appears to have the RBW logo (good imagination). The 6289421 WIRE ASM - GROUND is ~12 long and the end "connector" at the horn has an internal serrated lock washer. I don't have a 138485 L. WASHER so it was either lost sometime in the car's life or since the wire end connector has the internal lock washer it might have not been used. I don't know the configuration of the wire end connector at the SUPPORT ASM, sorry; but I wasn't going to remove it to check. Hope this helps. Pete

[Al R.]

Re: Help AC Car Pass Side Horn Mount

Kirk, I'm in Tn, but when I get in I'll recheck mine and let you know. If possible, I'll try to get you a picture. Al

[Scott S.]

Re: Help AC Car Pass Side Horn Mount

Is it possible to get a picture of that hole from you or someone?

Kirk

Kirk,

I was out working on the car this afternoon, took pictures of the radiator support and will post them later this evening.

[John H.]

Re: Help AC Car Pass Side Horn Mount

The .152"/.156" hole for the upper attachment of the horn ground wire wasn't in the radiator support originally - it was drilled at assembly. Any time a hole diameter is shown in the A.I.M., it was drilled at St. Louis.

[Scott S.]

Re: Help AC Car Pass Side Horn Mount

Kirk,

Below are two pictures of the radiator support on my '67 small block. I drew arrows pointing to where I thought the ground wire attached, based on comments in this Thread. However, I don't think it can be the original radiator support, because it has the crossed reinforcement rods. If I understand correctly, the radiator supports for cars with C60 did not have these reinforcements.

If that is the case, then there would be no reason to have drilled a .152-.156" hole in an original radiator support designed for a non-A/C car... at least not on the assembly line.

This car had front-end damage around 1971, and we have discovered several earlier model year parts that were used to make repairs. The lower valance-to-grille area was put together like a '65, using the 1965 center grille/nose support rod (and no 1967 center grille rod was present, Item 1 on 11-13-B1, GM # 3897387, was missing).

So, I don't think my pictures will help.

Pictures of an undamaged original '67 small block C-60 radiator support, on the other hand, would be worth about a billion words

[Peter L.]

Re: Help AC Car Pass Side Horn Mount

Scott - Nice photos. The location of the hole shown in your photos looks to be exactly where it is located on our 67 w/C60 which has the original SUPPORT ASM.

Kirk - FYI, the horn ground wire on our car has a black covering.

Pete