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Found it!


But before I get to that, there are a few more little electrical mysteries. Please see the photo of the back of the instrument cluster, the items with the pink circles. I have no loose wires.  Is something supposed be plugged in?


I was thinking of using wedge base LED lights in the sockets identified by bits of blue tape; anyone have any comments about this?

And then in the photo from the steering wheel side, there is a two-wired bulb in a simple plastic push-in mount. This is not a push-in and twist device. The bulb turns on whenever the headlights are turned on. Beats me what this bulb is supposed to illuminate.


Now the FOUND IT:


Awhile back I asked about where to find the sockets (several were disintegrated).  Auto parts places, even Datsun parts places didn’t know where to get the sockets. Well, the sockets are not rare, they are a part common on older US cars. Here is the eBay site I bought from:  retromotive (29661) on eBay.


I only bought five because I didn’t know if they would fit. They fit perfectly. I am going to replace the remaining five old ones. Just a little word of caution, some of the ones I received had a teeny bit of residual plastic flash from molding.  If you don’t trim this, it can make it very hard to remove the socket if you ever need to remove the socket because the untrimmed plastic tends to wedge the socket too firmly in the circuit board.


I have included photos and a drawing I did of the socket shape with the relevant dimensions.




36733112184_41993c1b54_k.jpg194 wedge bulb socket diagram by Donald Broz, on Flickr


36733109364_7bf06c1a67_k.jpgBack of instrument panel by Donald Broz, on Flickr


37443782231_531619bcfa_b.jpgUnknown bulb in dash by Donald Broz, on Flickr





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The one closer to the center of the cluster goes to pin 2 on the cluster wiring, and shows as not connected on the '73 610 wiring diagram.  Probably for something not used in US models.


The one in the corner is a takeoff for the dash illumination as well, for whatever accessory gauge is to the right of the speedometer.  Clock?  Tach? 


The extra bulb shows it's for the tach OR the heater control illumination, or even the ash tray illumination light.  They all have the same color wires, being on the same circuit.

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This is what came up for me when I did a search for 1973 Datsun sockets, I forget what search engine I used.


It seems that the 5/8" sockets are a common part part for many old cars.


These "Mopar" 5/8" sockets have worked out perfect for me. Just remember to look REAL close for excess plastic flash. If you don't trim this with an exacto knife it can be a bit of a bear to remove the socket.


I did my drawing (see earlier post) of the sockets I received so anyone can compare these sockets to what you have.


If anyone has experience with LED (wedge base) replacements for filament 194 (wedge base), let me know what your experience was.

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If anyone has experience with LED (wedge base) replacements for filament 194 (wedge base), let me know what your experience was.


I replaced all of the 194 dash lights with leds in my Monte Carlo.  I don't remember the specific part number, but I got them from http://www.superbrightleds.com and I've been pretty happy with them.  They have a good assortment of colors to choose from.

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