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Rear Wiring harness
Posted by: corvairjer ()
Date: March 20, 2017 07:11AM

Has anyone had any problems with a brand new rear harness from Clark's? When I step on the brakes the left side is bright and right side is dim.The opposite filaments of the 1157 bulbs are working.Blinkers are also opposite, tail lights are fine as is all the other lighting, all grounds are clean. Its a 1966 and all the harnesses are new except under dash.

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Re: Rear Wiring harness
Posted by: MattNall ()
Date: March 20, 2017 08:15AM

bad grounding of sockets.....





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

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Re: Rear Wiring harness
Posted by: BobV66Vair ()
Date: March 20, 2017 08:19AM

It is also possible to force the 1157 in backwards. It just tiny bumps that show the correct installation. Try checking that.

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: Rear Wiring harness
Posted by: 66vairman ()
Date: March 20, 2017 08:43AM

I've used a few of the M&H harnesses from Clark's without any issues, but mistakes happen.

If the other possibilities already mentioned are not an issue, simply look at were the wires go in the sockets. I recall the running lamp wire is the same color and in the same location on each socket. If it is reversed on the "dim" socket - then it was mis-wired. If it is an M&H harness the warranty card says to call them DIRECTLY and they will take care of it.

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Re: Rear Wiring harness
Posted by: Murphy ()
Date: March 20, 2017 10:09AM

The retaining plate that holds the light assembly to the car touches the body and provides the ground. Make sure where this plate touches the body there is no rust or undercoating between the two pieces. Clean it up and your lights will work fine.

65 Monza Coupe
61 500 Coupe (under Construction) Getting close.

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Re: Rear Wiring harness
Posted by: oldqmguy ()
Date: March 20, 2017 11:12AM

I agree, "check the grounds" before going much farther!

They DO 'go bad' even though they look good!

Then check to make sure the bulbs are installed correctly and that the sockets are wired the same! If it isn't a 'simple' solution contact M&H!

Regards,

Dale cool smiley

Dale E. Smiley CPBE
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT (Member of CORSA & Circle City Corvairs)
Avon, Indiana
WB9SFF
Current Project: 1967 4-Door Monza PG!

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Re: Rear Wiring harness
Posted by: 66vairman ()
Date: March 20, 2017 02:04PM

Murphy Wrote:
-------------------------------------------------------
> The retaining plate that holds the light assembly
> to the car touches the body and provides the
> ground. Make sure where this plate touches the
> body there is no rust or undercoating between the
> two pieces. Clean it up and your lights will work
> fine.

There is a gasket between between the lamp housing and body - no ground connection. The only housing to body electrical connection is via the housing to body wire nuts on an LM, housing to body screws on EM. Not the best setup, but fine when new and clean. Sometimes the housing gets corroded where the socket ground contacts fit.

A lot of folks add ground wires to the sockets and run them to the body (in a clean corrosion free spot).

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Re: Rear Wiring harness
Posted by: Marco_a_p ()
Date: March 20, 2017 04:15PM

Bulb is in backwards.
A bad ground would not make the tail light bright and directional/brake light dimmer. A bad ground would cause the tail light go out and brake/directional to be dim. BTDT 😉

Marco Padilla - Realtor BRE#01944189

Century 21 Crest
1501 West Magnolia Blvd
Burbank, CA 91506
213-272-3239 Cell

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Re: Rear Wiring harness
Posted by: PGVair ()
Date: March 20, 2017 04:23PM

If none of the other suggestions work, check the instrument panel ground strap. There is a screw beside the steering column that goes through the ground strap. If that screw is missing or loose, strange things can happen with the lights.

Wade

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Re: Rear Wiring harness
Posted by: Murphy ()
Date: March 20, 2017 04:28PM

66vairman Wrote:
-------------------------------------------------------
> Murphy Wrote:
> --------------------------------------------------
> -----
> > The retaining plate that holds the light
> assembly
> > to the car touches the body and provides the
> > ground. Make sure where this plate touches the
> > body there is no rust or undercoating between
> the
> > two pieces. Clean it up and your lights will
> work
> > fine.
>
> There is a gasket between between the lamp housing
> and body - no ground connection. The only housing
> to body electrical connection is via the housing
> to body wire nuts on an LM, housing to body screws
> on EM. Not the best setup, but fine when new and
> clean. Sometimes the housing gets corroded where
> the socket ground contacts fit.
>
> A lot of folks add ground wires to the sockets and
> run them to the body (in a clean corrosion free
> spot).

Sorry 66vairman, for you know not of what you speak. I just went through this on my '61 restoration.
On an early model, how do you think the socket gets grounded?...through the screws that screw the tail lamp housing to the retaining plate.
If you understand how this works, you don't need any grounding jumpers.

65 Monza Coupe
61 500 Coupe (under Construction) Getting close.



Edited 1 time(s). Last edit at 03/20/2017 04:31PM by Murphy.

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Re: Rear Wiring harness
Posted by: 66vairman ()
Date: March 20, 2017 05:35PM

Yeah Murph - what I said. On these old cars adding the ground wire to the bulb sockets gets rid of the "I have to go jiggle the socket every so often to make it ground" complaints.

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Re: Rear Wiring harness
Posted by: corvairjer ()
Date: March 20, 2017 06:11PM

Already addressed all of the suggestions thank you. Don't think its in the back of the car. The lights work when the sockets are out of the housings.

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Re: Rear Wiring harness
Posted by: MattNall ()
Date: March 20, 2017 06:26PM

Where are they getting a ground?





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

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Re: Rear Wiring harness
Posted by: cnicol ()
Date: March 20, 2017 06:33PM

Since the tail light circuit comes to the engine compartment as a single conductor and then splits three ways (right tail, left tail, license), the pretty much has to be at the rear of the car.

I suggest removing the sockets from the body and the bulbs from the sockets.

Turn the tail lights on.

Using a TEST LIGHT, ensure that you're only getting +12v on the brown wire at each socket.

Then compare the left and right sockets to make sure the brown wires are in the same location on each socket. Make sure the low pin (1157 has a low and high pin on each side) is in the same spot on each socket.)

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe project
65 White 4-dr 110/AC/PG (parts)
66 Sprint Corsa convt - First car! Re-purchased 43 years later

+18 Tons of parts

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Re: Rear Wiring harness
Posted by: PGVair ()
Date: March 20, 2017 06:46PM

Do you know if the turn signal switch in the steering column has been messed with in the past? The brake lights, as well as the turn signals, go through that switch. If you find a voltage problem after you do what Craig suggested, you should check the instrument panel ground strap since its easy to check. You also might have to make sure the turn signal switch is okay (not damaged or corroded internally). Since you said the turn signals are opposite, it could be something isn't right in the turn signal switch.

Wade

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Re: Rear Wiring harness
Posted by: 7004doorL ()
Date: March 20, 2017 06:53PM

Yes, I did have a problem. With a new harness. Fixed now. It was inside the rear
harness plug

Is it possible on your car to use a jumper wire from + on Battery to the
Left and Right rear tail and brake lights easily inside the engine compartment?

To verify the grounds and the lights? Wires are color coded.

Easy to do on the 1960.

Mike
1960 4 Door
80 HP PG

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Re: Rear Wiring harness
Posted by: Frank DuVal ()
Date: March 21, 2017 09:38AM

I'm with Matt. The lamps cannot operate properly with the sockets hanging out of the housings with a harness made with original sockets! There is no ground!eye popping smiley

To operate the lamp with the socket hanging out of the housing, I use an alligator jump lead from the metal clip on the socket to a good ground.

Frank DuVal

Fredericksburg, VA

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Re: Rear Wiring harness
Posted by: larry202br ()
Date: March 21, 2017 09:52AM

Frank DuVal Wrote:
-------------------------------------------------------
> I'm with Matt. The lamps cannot operate properly
> with the sockets hanging out of the housings with
> a harness made with original sockets! There is no
> ground!eye popping smiley
>
> To operate the lamp with the socket hanging out of
> the housing, I use an alligator jump lead from the
> metal clip on the socket to a good ground.
They could get a "return" through the other filament. Which could cause them to light up in "reverse" brightness.

1961 rampside with a 65 / 67 110 engine, car four speed.
Now I have 1965 convertible as well, got it running in June, autocrossed in July 2016 at the convention!

KC0SKX
Olathe, ks
HACOA

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Re: Rear Wiring harness
Posted by: WCcorsa ()
Date: March 21, 2017 09:55AM

A faulty new M&H wiring harness was the problem?

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Re: Rear Wiring harness
Posted by: 7004doorL ()
Date: March 21, 2017 11:17AM

In my case, Yes. No rear taillights at first.

Problem was inside the plug.

Mike
1960 4 Door
80 HP PG

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