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Author Topic: Ground strap speedo pod  (Read 3975 times)
68Zproject
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« on: May 27, 2010, 06:04:04 PM »

What did the ground strap look like originally on the back of the 68 cluster?  Was it a long wire type thing or was it a thin flat piece of metal like the one HBC sells?
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68Z28
flyingskibiker
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« Reply #1 on: May 27, 2010, 06:12:51 PM »

I thought it was both?  There is a ground wire.  Then, some kind of metal bracket/strap thing.  But that might not be for ground?  Found it.  '68 AIM: UPC 12, sheet B2.
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68Zproject
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« Reply #2 on: May 27, 2010, 07:09:34 PM »

There looks to be two.  The page you were on shows something that looks like the HBC ground strap that the Screw #1 goes to.  The one I was thinking of is on page B3 and goes around the socket for the high beam indicator.  Mine is broken and I was looking for a repro of that and can't find one.
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68Z28
big iron
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« Reply #3 on: May 27, 2010, 07:58:23 PM »

Just for thought.
UPC 12 B3 is the same grounding system as used in 67. The 67 system could have been carried over into some the early 68's. UPC 12 B2 looks like an early 68 system with the flat grounding wire. The ground wire at the rear of the cluster was a mid year change.
Anybody out there with an early 68 with the 67 system?
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flyingskibiker
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« Reply #4 on: May 28, 2010, 08:18:51 PM »

Yah, mine looks like (through a little inspection mirror and a cramped neck) the socket has an integral strap that runs up to the screw above.  I don't see anything like that metal(?) wire in B3...  There is nothing around/under the socket screws or anything.  But I DO have console w/ gauges.  Would that make a difference?  I have a 11C '68.
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big iron
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« Reply #5 on: May 28, 2010, 09:45:51 PM »

Looking at UPC 12 B2, do you have the ground wire ( view A) # 6 ?
Yah, mine looks like (through a little inspection mirror and a cramped neck) the socket has an integral strap that runs up to the screw above.  I don't see anything like that metal(?) wire in B3...  There is nothing around/under the socket screws or anything.  But I DO have console w/ gauges.  Would that make a difference?  I have a 11C '68.
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big iron
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« Reply #6 on: May 28, 2010, 10:15:26 PM »

You can get one off a 67. Take the broken wire and go to the hobby shop and they can fix you up with the wire you need (airplane landing gear). What is the build date on your ride?
Bob
There looks to be two.  The page you were on shows something that looks like the HBC ground strap that the Screw #1 goes to.  The one I was thinking of is on page B3 and goes around the socket for the high beam indicator.  Mine is broken and I was looking for a repro of that and can't find one.
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68Zproject
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« Reply #7 on: May 29, 2010, 12:26:17 AM »

Mine is an 05D of 68.  I was thinking it would be easy to make one, I just wondered if there was a repro.  Thanks for the heads up on the hobby shop.  I have one pretty close to the house.  I'm going to look and see if mine has both or just the wire.
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68Z28
big iron
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« Reply #8 on: May 29, 2010, 09:07:42 AM »

If your build date is 11C 67, then I think you have the correct ground system, if you do not have the ground wire (view A#6). RPO U17 gages would have no interaction with the cluster ground system.
Looking at UPC 12 B2, do you have the ground wire ( view A) # 6 ?
Yah, mine looks like (through a little inspection mirror and a cramped neck) the socket has an integral strap that runs up to the screw above.  I don't see anything like that metal(?) wire in B3...  There is nothing around/under the socket screws or anything.  But I DO have console w/ gages.  Would that make a difference?  I have a 11C '68.
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flyingskibiker
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« Reply #9 on: May 29, 2010, 06:23:21 PM »

If your build date is 11C 67, then I think you have the correct ground system, if you do not have the ground wire (view A#6). RPO U17 gages would have no interaction with the cluster ground system.
Looking at UPC 12 B2, do you have the ground wire ( view A) # 6 ?
Yah, mine looks like (through a little inspection mirror and a cramped neck) the socket has an integral strap that runs up to the screw above.  I don't see anything like that metal(?) wire in B3...  There is nothing around/under the socket screws or anything.  But I DO have console w/ gages.  Would that make a difference?  I have a 11C '68.

All I have is the metal strap.  I THOUGHT I had the ground wire #6, too.  I may add it when I replace the harnesses...



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big iron
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« Reply #10 on: May 29, 2010, 07:39:32 PM »

flyingskibiker,
Great pictures of a 68 cluster.
In the first picture, is the lockwasher impression in the metal ground strap original, or was it something you added?
The 05D 68 build that 68zproject has should look like the cluster you have. except it should have the additional ground wire.
I wonder if that revision ever made it into production. Maybe someone with a late 68 build date (02 68>) could answer that question.
Bob
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flyingskibiker
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« Reply #11 on: May 30, 2010, 12:59:40 AM »

As far as I know, all that is "above" that strap is a J nut for the screw to go in.  I can check to see if there is something additional there...  It is currently out of the car.  I saw some stuff back there that needed attention.  So, out it came...

The weird thing is that I think that the connector to the rear harness is up nest to the defrost outlet in the dash!  The wire colors match.  But I always thought that connector was behind the kick panel and E brake...  Weird.
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RonM
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« Reply #12 on: May 30, 2010, 09:55:59 AM »

I'm putting the dash back together this weekend so right now I can look at everything you guys are talking about. My car is an 07D and it has both the cluster ground strap and the cluster ground wire. In addition I have a service bulletins binder for the '68 models and it shows the ground wire coming into effect on vehicles built after October '67. Hope this helps, RonM.
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big iron
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« Reply #13 on: May 30, 2010, 09:24:09 PM »

RonM,
Great info.,Flyingskibiker's 11C 67 build could have been built with the additional ground wire. The only question left, did any of the early production 68's have the small ground wire instead of the strap?
Just wondering, is the service bulletins binder something you can purchase or is it a private thing.
Thanks
Bob

I'm putting the dash back together this weekend so right now I can look at everything you guys are talking about. My car is an 07D and it has both the cluster ground strap and the cluster ground wire. In addition I have a service bulletins binder for the '68 models and it shows the ground wire coming into effect on vehicles built after October '67. Hope this helps, RonM.
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flyingskibiker
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« Reply #14 on: May 31, 2010, 12:29:04 AM »

Right.  Well, my car is no numbers car.  So, I will be putting extra grounds in MANY places...  Well, instruments (cluster and console), anywayz...  Who knows what else.  Again, I'll be rewiring my car along the way.  Good oportunity!
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RonM
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« Reply #15 on: May 31, 2010, 06:33:04 AM »

The bulletin dealing with the ground wire is dated Jan. 2, 1968, so it's anyone's guess when it came into effect. As for the binder, I picked it up on Ebay 4 or 5 years ago. It's loaded with interesting reading (bulletins, monthly news letters, instructional booklets, spec. sheets, etc.). One I find real interesting has to do with the early 427 Corvettes. It looks like they were having problems with overheating (new body design I suppose), one of the steps to correct the problem was to cut out openings in the lower valance panel and touch up raw edges with body color. They even supplied the template as part of the technical bulletin. Can you imagine dropping off your Vette at the dealer and then picking it up at the end of the day with touched up openings in the lower valance. That must have been entertaining, RonM.
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68Zproject
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« Reply #16 on: May 31, 2010, 08:44:07 PM »

Well, I finally got under my dash and took it out part-way.  I have the wire, B2 view A and I have the solid round strap that goes to the high beam light B3 by the #7 bulb.  Not the flat strip like on post #9.  This would be correct for an 05D?
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68Z28
big iron
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« Reply #17 on: June 01, 2010, 09:59:12 PM »

Your 05D ( May 4th week 68 ) should have the B2 view A setup. What is the date on the circuit board on the back of the cluster?
Well, I finally got under my dash and took it out part-way.  I have the wire, B2 view A and I have the solid round strap that goes to the high beam light B3 by the #7 bulb.  Not the flat strip like on post #9.  This would be correct for an 05D?
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68Zproject
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« Reply #18 on: June 01, 2010, 10:14:36 PM »

Your 05D ( May 4th week 68 ) should have the B2 view A setup. What is the date on the circuit board on the back of the cluster?


No flat strip like on flyingskibiker?  top picture  http://camaros.org/forum/index.php?topic=5778.0
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68Z28
RonM
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« Reply #19 on: June 02, 2010, 04:08:41 AM »

My car has the same ground strap pictured in reply #9. Hope this helps, RonM.
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68Zproject
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« Reply #20 on: June 02, 2010, 06:11:48 PM »

My car has the same ground strap pictured in reply #9. Hope this helps, RonM.

So, some time after Jan 2 1968, certainly in time for my car, it would have changed from the wire around the high beam light to the flat strip.
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68Z28
big iron
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« Reply #21 on: June 02, 2010, 09:02:49 PM »

Yes, and you should have the additional ground wire on the back of the cluster.
My car has the same ground strap pictured in reply #9. Hope this helps, RonM.

So, some time after Jan 2 1968, certainly in time for my car, it would have changed from the wire around the high beam light to the flat strip.
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RonM
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« Reply #22 on: June 03, 2010, 02:37:32 PM »

The bulletin dated Jan. 2, 1968 had nothing to do with the ground strap for the high-beam indicator, only the ground wire connected to the bottom screw on the back of the cluster and the other end grounded to the pedal support in order to correct problems with the dash lights, fuel gauge or clock. The ground strap alone wasn't a good enough ground. Hope this helps, RonM.
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68Zproject
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« Reply #23 on: June 03, 2010, 05:27:53 PM »

I guess the info I'm trying to understand is the type of ground used at the top of the cluster.  The info seems to be that the round stiff wire around the high beam indicator is what came in 67's and was maybe used for some early 68's.  The flat strip was a later year change and is what should be on my car build date.  Then the additional ground wire at the bottom was added early in 1968 (which I have).
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68Z28
big iron
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« Reply #24 on: June 03, 2010, 07:41:30 PM »

Correct.
I guess the info I'm trying to understand is the type of ground used at the top of the cluster.  The info seems to be that the round stiff wire around the high beam indicator is what came in 67's and was maybe used for some early 68's.  The flat strip was a later year change and is what should be on my car build date.  Then the additional ground wire at the bottom was added early in 1968 (which I have).
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