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Old Jul 14, 2017 | 02:32 PM
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Default T-3 Headlight bulbs

I am cleaning out the shop and found a box of 5 3/4" T-3 bulbs. Can someone tell me the difference between the 2 prong and the 3 prong bulbs? The 2 prong bulbs have a clear T-3 logo in the center and the 3 prong bulbs have a ribbed logo in the center. The bulbs are in excellent condition (no sandblasting) and I will be selling them as soon as I determine what they are.

TIA
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Old Jul 14, 2017 | 02:58 PM
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Two prong are high beam; three prong are low beam.
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Old Jul 14, 2017 | 03:18 PM
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Correct. But, more precisely, the 3-prong bulbs are Hi/Lo beam bulbs: they are operational at ALL times.
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Old Jul 14, 2017 | 03:33 PM
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Hi cj,
The original T-3 lamps are of interest to some restorers.
One thing that indicates what year car the lamps are appropriate for is the configuration of the T logo and the triangle or lack of triangle around it.
Regards,
Alan

Here's an example:
T-3 in a triangle with vertical lines in the triangle. Used from 68 through 'late-ish' 71 production.


Last edited by Alan 71; Jul 14, 2017 at 03:34 PM.
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Old Jul 14, 2017 | 03:52 PM
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Thanks for the info Alan. I have seven bulbs...only one has the ribbed logo. The rest have the clear logo. Do you know what their application was? These bulbs are in excellent condition.

Regards, Bob
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Old Jul 14, 2017 | 04:07 PM
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Here's a small drawing I came up with from a vendor years ago.



Attachment 48119444

Last edited by Don Rickles; Aug 6, 2018 at 08:20 AM.
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Old Jul 14, 2017 | 04:21 PM
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[QUOTE=War Bonnet;1595146394]Here's a small drawing I came up with from a vendor years ago.

Many Thanks WB,

Exactly what I needed!

Regards,

Bob
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Old Jul 14, 2017 | 05:10 PM
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I have been 'hoarding' some T-3 Bulbs.

The NCRS guys want these....the rest of us don't really.

The old T-3's rremind me of the the old LUCAS saying...
Lucas= prince of darkness.

I will say that if the bulbs have that grey cast to them...the tungsten plating the inside of the bulb...they are no where near as valuable as some bright shiny clear ones.

Goodluck.
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Old Jul 14, 2017 | 05:11 PM
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Originally Posted by War Bonnet
Here's a small drawing I came up with from a vendor years ago.


that is nailing it, good job.
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Old Jul 14, 2017 | 05:14 PM
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Love my T3's
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Old Jul 14, 2017 | 05:27 PM
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Originally Posted by jr9170
Love my T3's
jr9170, I had one in Laguna Gray... Man do I miss it !!!

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Old Jul 14, 2017 | 06:24 PM
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Laguna Gray great color...
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Old Jul 14, 2017 | 07:28 PM
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