64 Impala Tail Light Question.

3829 Views 5 Replies 3 Participants Last post by Coppertop, Aug 23, 2013

rocks66ss

Discussion Starter · Aug 21, 2013

I have a friend who has a 64 Impala, has had it since new. BTY, it a 409/425hp 4 speed convertible. Over the years he has done some questionable things to it.

Here is the problem. There are 3 tail lights, the center one originally being a backup light. years ago he decided he wanted the center light to be a tail light, turn signal, brake light just like the outer and inner light, so he tapped into the inside light and added a socket for a 1157 bulb and turned the center backup light into a tail light, he did replace the white lens with a red one.

Fast forward to this weekend. he brought it to my house and asked me to replace the socket for him because the metal tab had broken and to make ground he had a piece of aluminum foil wedged in there.

After replacing the socket and bulb, it functions, but it is not nearly as bright as the light on the far outside. I didn't see it before so I don't know if all three lights were the same brightness to start with.

Any suggestions on why the center light that's tapped into the inside light is not as bright as the far outside tail light. I have made doubly sure the sockets are grounded well. What am I missing?

Rocky

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rocks66ss

Discussion Starter · #5 · Aug 22, 2013 (Edited)

Coppertop said:
I sure hope it is!

I think you meant in series. But, both the middle and the inner would be dim as they would both only be seeing half the battery voltage.

Rocky-

How dare you ask this here! Afterall, we have a sister Impala Tech site! l
l

Couple of thoughts....You may have the socket grounded good, but how good is the ground to the sheet metal? If memory serves me correct The inner and middle are apart of the trunk lid. Did GM run a dedicated ground to ensure the lights are grounded, or did they just depend on the hinges and latch to make "enough" ground. You're pulling more current now.

Also, if this is an original car, maybe the inner wire feed has a questionable connection so the extra current being pulled thru it is now showing up as a dimmer lamp. Bulbs are like snowflakes, they maybe the same type, but some can appear dimmer then others when there is a voltage feed issue.

How is the tail light brightness??? I'm assuming you're seeing the brake/turn brightness being affected??

Anything different between the left and the right trunk lid mounted lamps/wiring/factory grounds????

Joe,
It is all the time. When you turn the headlights on, the tail light is brighter on the outside than the center and inner that on the trunk lid.

Like I said I just replaced what was there, I cut the old socket wires, Black & White, and hooked the new socket exactly like it was, Black to black, and white to white. It was a replacement socket just like that had been previously replaced.

Is it possible that the center socket in question that was replace, that is tapped off of the inside socket which is the end of the line, has the wires on the wrong side? Because like I said I just replace what had already been one before me exactly like it was. So if that was the case, if I removed the bulb from the center socket, would the inside one get brighter?

BTW, I did go to the sister sight, and the last time I had been there was 7/3/2011 But I decided to come here where the real experts are :yes:

Rocky

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