Dual filament bulb orientation - Vintage Mustang Forums
 
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post #1 of 8 (permalink) Old 06-15-2019, 04:54 PM Thread Starter
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Dual filament bulb orientation

Hello everyone,
I know that dual filament bulbs cannot be installed backwards, but I want to make sure that my sockets aren't wired backwards. Should the taillights be brighter than the brake lights? Or should the brake lights be brighter than the taillights?
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post #2 of 8 (permalink) Old 06-15-2019, 05:19 PM
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Brake lights brighter

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post #3 of 8 (permalink) Old 06-15-2019, 05:47 PM
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The sockets are old and possibly worn a bit, none the less, it is possible to put them in backwards. Inspect the ridges on the socket, one is deeper than the other. Match up the pins on the bulb, pin closest to the bottom of the light goes in the deeper groove, the pin closest to the glass goes in the shallow/shorter groove.

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post #4 of 8 (permalink) Old 06-16-2019, 02:05 AM
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Small filament is brake. Large is the park.

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post #5 of 8 (permalink) Old 06-17-2019, 08:46 PM Thread Starter
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Thanks all! They must have gotten flipped around somehow.
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post #6 of 8 (permalink) Old 06-17-2019, 10:48 PM
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Quote:
Originally Posted by Feethurt View Post
They must have gotten flipped around somehow.

Notice in the attached photo that the fiber/plastic disc that holds the brass contacts for the 1157 bulb is supposed to have a "tit" on its OD and there is supposed to be a corresponding "tunnel" in the metal socket that properly aligns the 2 brass contacts so that when the bulb is inserted the contacts on the base of the bulb align with the corresponding brass contact.
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post #7 of 8 (permalink) Old 06-17-2019, 10:56 PM
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Quote:
Originally Posted by awhtx View Post
Notice in the attached photo that the fiber/plastic disc that holds the brass contacts for the 1157 bulb is supposed to have a "tit" on its OD and there is supposed to be a corresponding "tunnel" in the metal socket that properly aligns the 2 brass contacts so that when the bulb is inserted the contacts on the base of the bulb align with the corresponding brass contact.
The problem is, the bulb has two tabs and it can be sometimes confusing which tab goes in which "tunnel"


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post #8 of 8 (permalink) Old 06-18-2019, 12:18 AM
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Originally Posted by 69GT350H View Post
The problem is, the bulb has two tabs and it can be sometimes confusing which tab goes in which "tunnel"

I have actually seen an 1157 installed backwards with the short pin installed in the long tunnel and vice versa. There is another tunnel that aligns the tit on the fiber disc.
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