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Tail light problem. '64
Posted by: Horndoc ()
Date: July 06, 2018 09:51AM

64 700 sedan. Directional and brake lights functioning properly. When I turn on the headlights, the left tail light glows bright, like the brake light brightness. Left directional will not function. Right side lights still function fine. It when I have the lights on the the left tail light is too bright. With lights off, all tail light functions are fine. I have cleaned all grounds and contact points. Also have a new turn signal switch.
I stumped.



Edited 1 time(s). Last edit at 07/06/2018 03:59PM by MattNall.

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Re: Tail light problem.
Posted by: Spectre ()
Date: July 06, 2018 09:57AM

It sounds like a grounding issue to me.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

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Re: Tail light problem.
Posted by: 66vairman ()
Date: July 06, 2018 10:07AM

The ground for the front headlight assembly is complicated.

If I recall correctly (and that's questionable - LOL), the headlight and turn/running lamp are socket is grounded to the headlamp housing frame that is grounded to the body through screws. Since the original headlamps were glass housings the headlamp has a ground terminal and wire to the headlamp housing frame.

Without going into all the ground path issues - just make sure the headlights on both sides have a good ground to the body (I usually add a ground wire from the headlamp lamp ground wire all the way into the trunk body ground to make the headlamps brighter). Make sure both turn/running front bulb sockets have a good ground to the body.

Note the rear tail lamp housings are notorious for ground problems to the body.

Good luck

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Re: Tail light problem.
Posted by: oldqmguy ()
Date: July 06, 2018 10:09AM

X2 David's comment!

This sure seems like a 'ground' problem. Electricity likes to find the shortest way to "ground" (electrical common point) and will 'sneak' thru odd paths when the intended ground is missing or corroded!

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Tail light problem.
Posted by: Horndoc ()
Date: July 06, 2018 11:03AM

I understand that this is a ground issue. The front lights all work fine. Is there a connection between the front lights and grounds to the tail light function?
I took both tail light housings apart and cleaned up the screws and connections between the housing and backing brackets, then brackets to body. The PO had replaced the housings. He had added a ground wire from the housing to the body on the right side only. I couldn’t find one on the left side. I cleaned the connections on that ground wire. Nothing seemed overly corroded.

Do I need to concentrate on the front lights even though they all work?

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Re: Tail light problem.
Posted by: 66vairman ()
Date: July 06, 2018 12:08PM

Horndoc Wrote:
-------------------------------------------------------

>
> Do I need to concentrate on the front lights even
> though they all work?


Go back and read my post.

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Re: Tail light problem.
Posted by: Horndoc ()
Date: July 06, 2018 12:19PM

I reread your post. You address the front lights and to check grounds. I don’t see the correlation to the tail lights. Thanks for your suggestion smiling smiley

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Re: Tail light problem.
Posted by: BobJ ()
Date: July 06, 2018 12:31PM

I always add a ground wire to the early model tail lights.

I solder a ground wire to the socket and then attach it to wiring harness ground. Neatly, of course. I do not want it to look like scabbed together wiring.
Always works wonders.

BobJ

Frostbite Falls, MN
CORSA since 72
62 Monza Sedan A/C with cloth bench seat option.
63 Spyder Convert
US Navy Vet

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Re: Tail light problem.
Posted by: TerribleTed ()
Date: July 06, 2018 01:08PM

Ground issues on either end can cause weird problems. make good grounds on both ends of the car.

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Re: Tail light problem.
Posted by: Horndoc ()
Date: July 06, 2018 01:54PM

Thanks Bob!

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Re: Tail light problem.
Posted by: Horndoc ()
Date: July 06, 2018 01:54PM

Thanks Ted!

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Re: Tail light problem.
Posted by: Ratt643 ()
Date: July 06, 2018 02:00PM

Check and make sure its the correct bulb in the left rear tail light. 1157 is the correct part number. Also, is the socket connected to the wiring harness by the factory connector? Sounds like the wires are reversed and the tail light power is lighting the stop/directional part of the bulb...


1964 Monza Coupe

Maryville, TN
U.S. 129 The"Tail Of The Dragon"

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Re: Tail light problem.
Posted by: Horndoc ()
Date: July 06, 2018 03:51PM

Rat, yes factory plug. The P.O. had wired the backup lights to work as second tail / brake lights. I went back to stock. It looks like there are 2 brown or green wires and a black / yellow wire coming out of the plug. Could I have the two brown wires reversed?

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Re: Tail light problem.
Posted by: MattNall ()
Date: July 06, 2018 03:58PM

I'm pretty sure on EM's the Brown wires are ONE for each taillight / TAIL Filament / DIM light





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Re: Tail light problem. '64
Posted by: MattNall ()
Date: July 06, 2018 04:01PM







MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Tail light problem.
Posted by: 66vairman ()
Date: July 07, 2018 11:31AM

Horndoc Wrote:
-------------------------------------------------------
> I reread your post. You address the front lights
> and to check grounds. I don’t see the
> correlation to the tail lights. Thanks for your
> suggestion smiling smiley

Maybe I read your post incorrectly, but you said the tail light problem happened only when the headlights were on. Basically make sure the grounds are good on both ends.

Yes I've seen wrong bulbs and reversed wires cause a "bright" tail lamp. So check that also. Matt posted the diagram.

Sometimes a bulb is jammed and not in the correct position. The bulbs should go in and rotate and lock with minimal effort. If they bind then clean the sockets and use some di-electric grease and the bulbs will go in easy.

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Re: Tail light problem. '64
Posted by: Raycr ()
Date: July 07, 2018 11:31AM

Try some new bulbs or switch left to right.I have seen where the filament will short out in the bulb and feed back from the marker light circuit to the turn circuit. If this happens it will feed back to both the front and back

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Re: Tail light problem. '64
Posted by: Horndoc ()
Date: July 08, 2018 12:39PM

Thanks guys

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