Size Matters 😀 - Impala Tech
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post #1 of 15 (permalink) Old 03-11-2019, 09:48 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Size Matters 😀

Hello everyone,

Haven't been on for a while, sorry.

I need some help with the size of the bulb sockets in the back of a 67 dash.
Are they 5/8 th's or 1/2 inch you know the ones that hold the push in bulbs, I think they're called wedge bulbs.

The popular websites list two sizes, so confusion rains.
The car is not handy to take one out and measure hence me asking.

I'm throwing this one our for any body to help me.

Thanks.
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post #2 of 15 (permalink) Old 03-12-2019, 07:42 AM
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Garage
Phillips 194 bulbs are the wedge type.

The 1895 bulb is the 2 pin socket type.

1969 Imapala convertible build thread here:
https://www.pro-touring.com/threads/...ghlight=impala
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post #3 of 15 (permalink) Old 03-12-2019, 04:46 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Thanks justjohn,

I'm not too concerned about the bulb size as I think thats the easy part to this problem of mine.

I need to know why they list two sizes of sockets that the bulbs go into, the sockets are the things the bulbs go into then are twisted into the back of the dash, I believe there is 14 of them in total so I don't want to buy the wrong size as they are priced at $4 bucks each, so thats about $60 bucks or so in total to buy all of them.

Can any one give me an idea whether they are 1/2 inch or 5/8 ths of an inch in size, I imagine that must be the measurement accross the hole they go in in the back of the dash, I'm not sure.

Thanks.
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post #4 of 15 (permalink) Old 03-12-2019, 05:01 PM
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on my 67 they are 5/8"
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post #5 of 15 (permalink) Old 03-12-2019, 10:27 PM Thread Starter
 
 
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Quote:
Originally Posted by 67SS View Post
on my 67 they are 5/8"
Thanks 67SS,

Sweet, I have an SS as well so am I too assume they are the same?

I'll wait and see if any one can add to this as far as size goes just to make sure.

Then I'll order some.
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post #6 of 15 (permalink) Old 03-14-2019, 01:17 PM
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No problem. I found out when I was converting to LED and wanted to replace the sockets. Ordered 1/2" and it was too small for the hole. ordered 5/8" and it fit perfect.
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post #7 of 15 (permalink) Old 03-14-2019, 08:03 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Size Mattered




Thanks again 67SS.
I was looking through a bit of paraphernalia I've got on the 67 and found the original Part number for the sockets, it is 2973932.
I then went to Rockauto and found out that they have them made by Standard Motor Products Part Number : S503A, 5/8 Th's in size.
Under the info link there are original part numbers listed and 2973932 is one of the OEM part numbers listed.
So now have some on order.


One less thing on my list.............
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post #8 of 15 (permalink) Old 03-25-2019, 07:01 AM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
Posts: 19
 
Hello all,


I got the sockets and LED bulbs today as you can see by the photo.


Sockets from Rockauto, took 8 days to get here, not bad I thought (Freight $11.99 Fedex)
Led Bulbs from Taiwan took a bit longer (9 days, free postage though)



The new set up (Socket & LED) is an 1/8th of an inch taller, don't know how that will go until I try to install them.


Will let you know how I go with the install.
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post #9 of 15 (permalink) Old 03-27-2019, 10:53 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Can You Tell The Difference ?

Hello all,

Well I found some time to have a go at changing the bulbs in the 67 dash today, wow what a pr**k of a job.
One has to be a contortionist to get one's arm up the back of the dash, maybe should have looked at taking the whole thing out, anyway hindsight.....


Took a couple of pic's before and after, you be the judge as to the outcome. My opinion is

(Just a side note both pic's are with the dimmer on full)


OK, after all the excitement of getting the bulbs in I turned on the dash lights and only half lit up, hmmmm I thought what did I do wrong, any ideas? All I have done is change the bulbs.
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post #10 of 15 (permalink) Old 03-28-2019, 12:22 AM
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Did the bulbs have offset bayonets? Some bulbs with two elements (different functions have an offset bayonet to keep the dim from being bright and vice versa. As far as I know dash lights only do one thing. Look at old bulbs to see if the bayonets are symmetrical.

Big Dave
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post #11 of 15 (permalink) Old 03-28-2019, 12:46 AM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Question Bayonets

Quote:
Originally Posted by Big Dave View Post
Did the bulbs have offset bayonets? Some bulbs with two elements (different functions have an offset bayonet to keep the dim from being bright and vice versa. As far as I know dash lights only do one thing. Look at old bulbs to see if the bayonets are symmetrical.

Big Dave
Hello Big Dave,

No the bulbs are T10 or wedge type (push in), no little pins at the base (bayonet).

Did I read somewhere that the bulbs have polarity (positive/negative) and I may have put them in backwards?
Thus not getting the current to go through and continue on along the circuit board?

Any ideas?
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post #12 of 15 (permalink) Old 03-28-2019, 09:52 AM
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LEDs are indeed polarized, as they are Light Emitting DIODES that have fixed positive and negative terminals. That is why I wondered if they were aligned with a different sized bayonet or one with an offset to fix polarity.

Big Dave
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post #13 of 15 (permalink) Old 03-28-2019, 11:17 AM
BA.
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Sounds like you had a 50/50 chance of success and got exactly that. lol. just razzing ya. I thought it was funny but I'm easily amused.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
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post #14 of 15 (permalink) Old 03-28-2019, 11:49 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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The light was on but nobody was home !

Quote:
Originally Posted by Big Dave. View Post
LEDs are indeed polarized, as they are Light Emitting DIODES that have fixed positive and negative terminals. That is why I wondered if they were aligned with a different sized bayonet or one with an offset to fix polarity.
Sorry Big Dave I didn't understand what you were trying to explain but now I do, will have to take the dash out and have a better look, should have done that in the first place, again hindsight........

Quote:
Originally Posted by BA. View Post
Sounds like you had a 50/50 chance of success and got exactly that. lol. just razzing ya. I thought it was funny but I'm easily amused.

Ha, Ha BA good to see some people still have a sense of humor .


It is never an easy job to do anything on these cars, just a labor of love till we get to end result, then enjoy.
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post #15 of 15 (permalink) Old 04-03-2019, 10:32 PM Thread Starter
 
 
Join Date: Oct 2014
Location: Brisbane, Australia
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Hello all,


Well got some time this morning to take another look at the dash bulbs in the 67 and wasn't as bad as I thought it would be to take the whole dash out.
Little bit of a stretch to undo the speedo cable but other than that no worries.
The dash trim was putting up a struggle but eventually gave in, wow that would be real easy to crack or break so be careful if you do it at any stage.
The problem with only having 50 % BA was, the little brass fingers (for the won't of a better word) at each side of the socket were not connecting to the circuit board on the back of the dash.
So it was just a case of a little adjusting and yahoo there was light.


Found a couple of other things I'm going to do so haven't put the dash back yet hence no picture, that will come later.
And yes the dimmer works with these LED bulbs.
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