67 Dimmer Switch-Correct Part Number

[David P.]

Hello All,
Need to replace my dimmer switch. Can anyone tell me the correct part number? (I have searched the forum and archive to no avail).
So far my research has revealed two possibilities:
1997028/D803
and
1997043/D809

Are either of these correct as equipped from factory? If not what is?
Thanks.
DAP

[Wayne M.]

Re: 67 Dimmer Switch-Correct Part Number

Hello All,
Need to replace my dimmer switch. Can anyone tell me the correct part number? (I have searched the forum and archive to no avail).
So far my research has revealed two possibilities:
1997028/D803; and 1997043/D809

Are either of these correct as equipped from factory? If not what is? ....

Dave -- the '65 AIM shows the "028"; My Jan 1970 Corvette parts catalog P&A30B shows same for '63 thru '70. Same on many Chev passenger and light trucks.

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

The 67 AIM shows 1997028 on UPC 12, sheet B6, as well as my 1967 Chevrolet Parts Catalog (effective April 1967)in Gr. 2.459.
GM # 1997028 was discontinued in Aug. 1971 and replaced with GM # 1997040 which was then discontinued in May 1972 and replaced with GM # 1997043. GM # 1997043 has been discontinued.

I believe that you can use GM # 12338706 (D808 and 2.25" tall) as a replacement switch but I do not have any official documentation. I think that you will find that a switch from an auto parts stores will be just as good as whatever is available currently from GM, nothing like the original.

I believe that my NOS 1997037 switch (2.5" tall) for my 1970 Camaro SS350 is similar to the 1997028 switch except that is slightly taller.

[Michael H.]

Re: 67 Dimmer Switch-Correct Part Number

The 67 AIM shows 1997028 on UPC 12, sheet B6, as well as my 1967 Chevrolet Parts Catalog (effective April 1967)in Gr. 2.459.
GM # 1997028 was discontinued in Aug. 1971 and replaced with GM # 1997040 which was then discontinued in May 1972 and replaced with GM # 1997043.

I think the 1997028 is the only one that has a flat top button. The later replacements have a dished button and are often plated with something gold instead of the correct/original zincad plating.

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

Pictured below are a couple of replacement switches.
Back in the early 1980's I replaced my original 1966 switch (Delco Remy) with a NOS 1997043 switch just because I was doing a frame-up restoration. I still have my original switch but it is somewhere in my garage attic.

[Peter L.]

Re: 67 Dimmer Switch-Correct Part Number

David - Michael brings out an important configuration feature , i.e., the flat top on the button, if you are looking to maintain originality. Later old stock and new -028 dimmer switches have the dished center configuration button which will function fine, but be different in appearance from the -028s istalled originally in Production. Pete

[Joe L.]

Re: 67 Dimmer Switch-Correct Part Number

The 67 AIM shows 1997028 on UPC 12, sheet B6, as well as my 1967 Chevrolet Parts Catalog (effective April 1967)in Gr. 2.459.
GM # 1997028 was discontinued in Aug. 1971 and replaced with GM # 1997040 which was then discontinued in May 1972 and replaced with GM # 1997043. GM # 1997043 has been discontinued.

I believe that you can use GM # 12338706 (D808 and 2.25" tall) as a replacement switch but I do not have any official documentation. I think that you will find that a switch from an auto parts stores will be just as good as whatever is available currently from GM, nothing like the original.

I believe that my NOS 1997037 switch (2.5" tall) for my 1970 Camaro SS350 is similar to the 1997028 switch except that is slightly taller.

Dave-----


GM #12338706 officially replaced the GM #1997043 in August, 1996. However, as I recall, there was a significant configuration change in the 1997043 over the many years of its availability. So, all 1997043's are not alike.

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

Pete,

Somewhere in my garage attic in a box is my original switch. Someday I will find it when looking for other parts. The NOS (actually NORS) 1997043 switch that I installed in my 1966 back in the 1980's has a yellow cadmium top. As I remember it was noticeably different when compared to the original switch.

Dave

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

However, as I recall, there was a significant configuration change in the 1997043 over the many years of its availability. So, all 1997043's are not alike.

Joe,

I agree.

Dave

[Wayne M.]

Re: 67 Dimmer Switch-Correct Part Number

Alright you guys ; now you've got me questioning what I've got, and where.

I thought the one on the left (just removed from my '65 coupe) was correct; turns out that the flat top (on right) that I pulled off a scrap yard Chev donor is TFP.

Notice the dished head has beefier mounting ears and is taller than the other. Both have the Delco Remy logo, but one on left is barely visible.

[Michael H.]

Re: 67 Dimmer Switch-Correct Part Number

Alright you guys ; now you've got me questioning what I've got, and where.


Notice the dished head has beefier mounting ears and is taller than the other. Both have the Delco Remy logo, but one on left is barely visible.

Sorry Wayne. I suppose this will cause a lot of owners to run out to the garage to see if they have the real thing.

The real dimmer switch for 63-67 would be the flat top design. I don't know when the dished style first appeared for service but my guess is some time in the 70's? I know for sure that one I ordered/received in about 1975 was the incorrect dished style.

I remember hearing that nice originals can be found in some early C3 cars that had some sort of pad covering the button. I don't know if they're the same as C2 though.

[David P.]

Re: 67 Dimmer Switch-Correct Part Number

Thanks for all the responses thus far, and for all the pics. I apologize if I created a stir.
DAP

[Jack H.]

Re: 67 Dimmer Switch-Correct Part Number

Yep, the one on the right is the real deal item... It's not just a matter of dished/flat top geometry. The factory originals had a pretty short shaft that wasn't all that hard to get stuck beneath loose carpet. The replacements had a longer plunger shaft and they stood WELL above the carpet.

Once you start judging interiors, you'll spot the replacement IMMEDIATELY!

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

Alright you guys ; now you've got me questioning what I've got, and where.

I thought the one on the left (just removed from my '65 coupe) was correct; turns out that the flat top (on right) that I pulled off a scrap yard Chev donor is TFP.

Notice the dished head has beefier mounting ears and is taller than the other. Both have the Delco Remy logo, but one on left is barely visible.

Wayne,

The taller switch of the left is GM # 1997037 assuming it is 2.5" tall. It looks the same as my NOS 1997037 (see photo in my 2:28 PM post) which is 2.5" tall as well as one I found in an "early" 1970 Z28.

Dave

[David L.]

Re: 67 Dimmer Switch-Correct Part Number

Yep, the one on the right is the real deal item... It's not just a matter of dished/flat top geometry. The factory originals had a pretty short shaft that wasn't all that hard to get stuck beneath loose carpet. The replacements had a longer plunger shaft and they stood WELL above the carpet.

Once you start judging interiors, you'll spot the replacement IMMEDIATELY!

Jack,

Was the carpet thicker in 1970 or did the GM engineers finally realize that the earlier switches were made too short?

Dave