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Old Aug 6, 2015 | 10:11 AM
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Default Fiber optics question

I have a 68 convertible that the rear fiber optics were cut where they connect at the shifter console. The rest is complete in the rear where they connect to the tail lights and license plate lamp. Can the severed connection be repaired easily or will I have to replace the entire harness? TIA
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Old Aug 6, 2015 | 10:41 AM
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Square off the ends of the three cables; clean the ends as well as possible; and reinsert them into the lens. You should be able to see light values.

Keep in mind there is a definite right, left, and center. Experimentation with a good flashlight will help in determing which is which.

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Old Aug 6, 2015 | 01:31 PM
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Originally Posted by Easy Mike
Square off the ends of the three cables; clean the ends as well as possible; and reinsert them into the lens. You should be able to see light values.

Keep in mind there is a definite right, left, and center. Experimentation with a good flashlight will help in determing which is which.

I cut the ends square and used a strong flashlight to see if they work. I had to clean some paint off the one's for the tail lights and they all work now including the license plate lamp. Do the cut ends just slide into the lens or do I need another part? Looks like I'll have to buy a new lens too since mines broken. Thanks Mike.
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Old Aug 6, 2015 | 02:15 PM
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Mike iirc they optic cable goes into a brass case with a flange on the end. It's also possible some of them go into a colored lense befor going into the lights.
I also recall a rubber grommet of sorts. You probably need to google pictures.
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Old Aug 6, 2015 | 03:03 PM
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here's a

pic
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Old Aug 6, 2015 | 04:02 PM
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Originally Posted by CAMS69
...Mike iirc they optic cable goes into a brass case with a flange on the end...
True. The stock harness had ferrules, but you lose those if you have to trim ends. Ask me how I know.

My replacement ferrules amount to three short lengths of tubing (source unknown) which is the approximate diameter of the lens openings. The actual FO cable then slides into the tubing friction fit.

The AIM shows the installation and has a note about color codes which I assume refers to stripes on the separate cables. I can't recall actual stripes on my cables, but the only trick is connecting left to left side, right to right side, and license lamp to the center.

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Old Aug 6, 2015 | 04:07 PM
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Originally Posted by Easy Mike
True. The stock harness had ferrules, but you lose those if you have to trim ends. Ask me how I know.

My replacement ferrules amount to three short lengths of tubing (source unknown) which is the approximate diameter of the lens openings. The actual FO cable then slides into the tubing friction fit.

The AIM shows the installation and has a note about color codes which I assume refers to stripes on the separate cables. I can't recall actual stripes on my cables, but the only trick is connecting left to left side, right to right side, and license lamp to the center.

I know that I don't have the parts needed that go into the lens in the shifter console, but at least I have all the pieces for the rear lights. I'll have to start looking to see where I can buy the ones I need. Thanks
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Old Aug 6, 2015 | 04:17 PM
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there are 3 metal friction fit ferules on the ends at the console on my 68.
Heaven only knows where to find them these days.
You could try Doc Rebuild, if anyone has them I would think he does.
If not post on the parts section WTB....
George may respond with them
Some one has 3 out there.
Marshal
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Old Aug 6, 2015 | 06:35 PM
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If you are gentle, you can use a pin punch to open up the crimps on the original brass ferrules, and reuse them. Lou.
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Old Aug 6, 2015 | 07:30 PM
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Hi s56,
Here's the connection for the three rear cables at the shifter plate lens in my 71.
I know the 68 is a bit different but I'm not sure how much.
So this pic may help or maybe not.
Regards,
Alan

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Old Aug 6, 2015 | 07:47 PM
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In my experience, they can be repaired but they will be dim. A new harness in probably your best bet.
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Old Aug 6, 2015 | 09:40 PM
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Couldn't a rivet with pin removed be a non purist replacement for that ferrule?
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Old Aug 6, 2015 | 10:03 PM
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Whatever just needs to be the right internal diameter for the fiber bundle. Since it is only passing light, and not an 'image', the fibers don't need to stay in a specific order. I would think a piece of heat-shrink tubing would do the job and hold the fibers together well. Just don't heat TOO hot and melt the glass fibers.
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Old Aug 6, 2015 | 10:17 PM
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While routing the fo is somewhat involved, I recall the rear complete harness wasn't that much. Personally I like to do it once, there will be plenty of non-planned "opportunities" to work on my Vette in the future.
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Old Aug 7, 2015 | 08:33 AM
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Originally Posted by Alan 71
......
Bingo. Per Alan's pic, I have no ferrules on my 68 and do not need them. My tubing takes the place of the ferrule and my FO slide into the tubing up to the lens.

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Old Aug 7, 2015 | 08:52 AM
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Hey Alan,
yes the '71 barbed ferules look the same as my '68.
As Lou said if they are still present they can be reused if gentle.
Mikes tubing fix is probably the next best idea I've heard of if the OEM
ferules are MIA.
Marshal
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Old Aug 7, 2015 | 09:27 AM
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My newly-acquired 68 convert has the same FO problem. Love it when previous owners just cut wires and leave things diconnected.
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Old Aug 7, 2015 | 10:20 AM
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Originally Posted by ronarndt
My newly-acquired 68 convert has the same FO problem. Love it when previous owners just cut wires and leave things diconnected.
Tell me about it. The PO for mine cut all the wiring harnesses in the front of the car.
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Old Aug 7, 2015 | 10:21 AM
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I'll try to find some of those ferrules in all my stuff. I can't help but wonder if they could be reproduced on my lathe.
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Old Aug 7, 2015 | 11:33 AM
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Originally Posted by sullyman56
Tell me about it. The PO for mine cut all the wiring harnesses in the front of the car.
Ouch! I think cut wiring harness is even worse. good luck with that.
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