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Old 12-18-2018, 07:49 PM
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Default Neutral Safety Switches

I have started picking up neutral safety switches when I think about it. I found 2 '69 Cads today, but both were missing their switches. I found 2 '70 Cads that still had theirs. The 2 '70s had different switches. One had a 4-post, the other had a 6-post switch. Several eBay listings show them as being the same from '69-'70 and some show '69-'73.

Can anyone tell me if these do, in fact, work for multiple years?
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Old 12-18-2018, 10:17 PM
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Photos of the 2 different switches out of '70 deVilles.
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Old 12-18-2018, 11:49 PM
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You can put a 70 switch on a 69 and start the car. The back up lights will not work and it doesn't have the vacuum port for the purge valve. So no they are not the same. It might be that the different models took different switches in the same year. I have a picture of a 69 on the computer. I'll post it.
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Old 12-19-2018, 12:17 AM
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Which switch? They obviously had more than one switch... at least in 1969 & 1970.
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Old 12-19-2018, 05:46 AM
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The switches many times will have a 3 digit number stamped on the metal face of them, which will correspond to the last 3 digits of the part number. There are quite a few different ones, and it is best to tag them with the year of the car that they were removed from. This will give you a good starting point, but not always, because if a switch failed, getting the car running is more important than things like back up lights, so they might have put the wrong switch into the column, just to get the neutral safety feature working. The switch pictured below is a 1993386 which corresponds to being a 1968 switch. Some years used as many as 4 different switches. Don't go by what eBay sellers claim, because they are usually more interested in selling a switch then they are in correctly identifying the switch. The best way is to use the stamped number, and without the stamped number, a visual representation of the terminals, and compare it to your original.
If you provide me the 3 digit numbers, I might be able to locate them in the parts book.
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Old 12-19-2018, 08:57 AM
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The 2 that I took out of '70 Cads are 063 and 137.
063 is identical to the one in Paul's photos. I am tagging them, as to model, year when I pull them off.
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Old 12-20-2018, 07:49 PM
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now here is the one I have on the peg board we were using it in the 69 till we discovered the backup lights didn't work. it's one I rebuilt. as you can see it's missing a couple of tabs. the number on the back is 137
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Old 12-20-2018, 10:09 PM
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Default Cadillac Parts Book

Here is what the Cadillac Chassis and Body Parts Catalog shows. Oddly enough, it makes no referrence to the 1994063 part number at all. Just the 1994137 part number.
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Old 12-20-2018, 10:38 PM
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NOS GM 1994063 transmission neutral safety and backup lamp switch stamped 063 fits 1969 1970 Cadillac all model, this is the early version
of the switch gm later superceded it to 1994137 and added terminals.
This switch has the vacuum control for the parking brake. Picture below

Quote:
I'm not sure exactly what year this did come from, but the parts catalog lists 69-73 as the same switch. Group 4.054 part number 1994063. Some where along the line, they changed the part number to 1994137, but still listed for those years. It may be they did change the position of the terminals from the original design.
http://forums.cadillaclasalleclub.or...topic=104775.0
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Old 12-20-2018, 10:45 PM
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My guess, and it is only a guess, is that the 4 terminal 1994063 is an early production switch, and that the 1993137 is a later production switch, as I have found this information on multiple websites, every time someone ask a question about the 1969 / 1970 neutral safety switch.
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