1966 Cadillac Turn Signal Switch repair

The 1966 is a fantastic car - but as most low mileage cars, it sometimes needs some work to fix some minor problems which were caused by not using the car for a longer period of time.
One of the few problems this cars had were some weird issues with the turn signal lights.

I´m a perfectionist and everything has to work on the Cadillacs that are in my garage ;-) - thats one of my rules ;-)

Strange things happened on the right rear and front turn signal lights when the headlights were on or off...

This light switch is made of "unobtainium", so I was pretty scared that it could be broken.

The switch is located underneath the dash and is screwed onto the steering column and is controlled and actuated by a steel cable that is coming from the turn signal lever.

On this car the cable was out of alignment and did not engage the switch correctly on the right side position and this intermediate position of the switch caused the various problems.
It took me quite a while to get the adjustment of the cable right again, as you carefully have to shorten or lengthen it with a nose-plier to get the right length.
I also adjusted the spring you can see on the picture below. This makes the switch more snappy. It now works perfectly and the lever moves much nicer!

the 1966 Cadillac turn signal switch as seen from underneath the dash - already removed from the steering column.


1967 Cadillac turn signal switch arrived

Today another 1967 Cadillac turn signal switch arrived for my 67 Deville which is in the shop at the moment with a broken switch. I found a nice NOS switch on ebay and finally it's the correct one. All the ones I bought in the past were the wrong ones as 3 different ones were available in the 1967 models! Non of them is still in production or reproduced and they are very hard to come by. Originally they were built by AC-Delco and Boyne and they are very different as I learned later... I already spent quite a sum for wrong NOS switches. Used ones are usually sold for $250.- to $300.- at the big Cadillac parts specialists... Here is a picture of the NOS one I found - it was manufactured by Boyne.


UPDATE 2010: In the meantime (since 2009) the Boyne switches they are getting reproduced and show up on ebay all the time. Also OPGI shows them in their Cadillac catalog. Its harder to find one for a T&T column as they are not getting reproduced so far. I do not know where one could find a switch for T&T though. If you know of any resource for T&T switches please let me know, I would love to have a spare one for my Eldorado!

When I was looking for a switch for my 1967 Deville, I only investigated resources for cars without T&T columns and this is what I found out:

According to the 1971 parts manual there are two different ones for standard column cars and one for T & T

  • 1967 - 1968 (Exc. T & T) Part # 7800483 - Switch, w/wiring harness (Delco-Remy)
  • 1967 - 1968 (Exc. T & T) Part # 7805675 - Switch, w/wiring harness (Boyne Products)
  • 1967 - 1968 (T &T) Part # 7805676 - Switch, w/wiring harness (Hazard warning switch an integral part)

The two different standard column switches can be identified without removal as the parts manual describes:
„Hazard warning switch is an integral part. Switches can be identified before disassembly as follows: The Delco Remy switch has a square hole for the hazard warning switch in the cover, the Boyne Products switch has a round hole for the hazard warning switch in the cover.“

The problem with the switch on my standard column DeVille was that the return cancel cam broke, and that non of the repair kits were available for the Boyne switch.

Replacing this switch in the steering column is quite a pain - below you can find the instructions from the shop manual on how to do it.
There is also a revised procedure for a much easier installation below in the “Cadillac Serviceman" from August 1967!

1967 Cadillac Steering Column


Click on each picture for a larger view!

The connections going to the directional signal switch - the turn signal switch connector

The Cadillac Serviceman from August 1967 shows a revised procedure for a much easier installation of the switch.


If you need the shop manual instructions for a tilt and telescope column click here! Or just use the procedure above!


The 67 is in the shop...

Today I visited the restoration shop with the 58 for the obligatory annual technical inspection. Of course it passed with flying colors without a problem.
Later I also dropped off the 67 there as some smaller things have to be repaired as I do not have the necessary tools nor skills to do them myself.

  • The front-suspension needs a rebuild and I do not have the presses to push some of the bushings in and out.
  • The switch for the directional switch in the steering column has to be replaced
  • Need a new ignition lock
  • The transmission has some leaks I could not find

The guys from who helped me with the restoration of my cars will take over.
In a couple of weeks I should have the car back. It will go directly into winter storage then. Today also was the last day to drive the 58. I will return the plates over winter.

The 67 at American Special Parts