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Author Topic: Ground Strap Question  (Read 5657 times)
sixt9x33rs
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« Reply #30 on: January 08, 2012, 10:20:23 PM »

My 69 Z/28 03D build has U63 and only has the straps on the subframe.
My 69 Convertible L65 04D U69 has all 4 straps.
Installation quantities must have been random?
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'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles
Ed Bertrand
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« Reply #31 on: January 09, 2012, 09:56:52 AM »

Quote
One last thought, I would think that there should have been an item added to the 69 AIM U63 A7 revision record to show the new view of the fenderwell to frame strap.

Only if it was a running change. If this began at the start of production (which it appears to be), it wouldn't have any kind of "change" date.

Ed
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JohnZ
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« Reply #32 on: January 09, 2012, 11:00:47 AM »

Ed,
Think you have a handle on it.
One last thought, I would think that there should have been an item added to the 69 AIM U63 A7 revision record to show the new view of the fenderwell to frame strap.
Bob

It wouldn't show in the revision record, as it was on the initial release sheet for the '69 model year; each sheet for the new model year started from scratch, with no reference to the preceding model year.
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'69 Z/28
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JohnZ
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« Reply #33 on: January 09, 2012, 11:03:00 AM »

Is it possible they just missed the strap when your build was assembled?

Yes, I'm sure it was just a missed operation; someone didn't drill the holes, so the strap didn't get installed.
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'69 Z/28
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jk1969z28
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« Reply #34 on: January 12, 2012, 12:34:38 AM »

Just to add one more question to this, while looking at more pictures on Ken Lucas's site, which by the way has some great photos, I noticed this picture https://picasaweb.google.com/LucasRestorations/SteveKate69Z281#5253880912096151058

This strap is attached at the block, is this incorrect, since after reading above it sounds like it should attach to the valve cover?
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Mark
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« Reply #35 on: January 12, 2012, 09:12:15 AM »

Yes its incorrect according to the AIM, it should be under the outer rear valve cover bolt, under the plug wire support.
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Mark C.
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« Reply #36 on: January 13, 2012, 06:58:58 PM »

1969 V8 - 4 straps. Two on the valve covers to the firewall, one on the firewall to the subframe and one on the inner fender to the subframe.
Ed

U63/A5 states "All Except C60". So does this mean A/C cars only have 3 straps?

Also, can someone recommend a vendor for these straps?
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Ed Bertrand
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« Reply #37 on: January 13, 2012, 07:39:50 PM »

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U63/A5 states "All Except C60". So does this mean A/C cars only have 3 straps?

No. U63/A5 is regarding the capacitor attachment. "All except C60" had it attached to the firewall under the ground strap, and all with "C60" had it attached to the evaporator assembly.

Quote
Also, can someone recommend a vendor for these straps?

All the vendors sell them. HERE'S the Classic Industries set.

Ed
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IZRSSS
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« Reply #38 on: January 13, 2012, 07:49:58 PM »

Thank you Ed.

Does anyone have a pic of this strap they can share (firewall to subframe). Seems like a tough angle for a shot...
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paceme
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« Reply #39 on: January 13, 2012, 08:26:33 PM »

Firewall to subframe ground strap.
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Steve Shauger
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« Reply #40 on: January 13, 2012, 08:32:25 PM »

Sweet...Thanx Steve!
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Boston14
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« Reply #41 on: January 13, 2012, 09:05:42 PM »

Here's mine (different angle)

boston14
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boston14

1969 RS/SS 350 Convertible
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Dave69x33
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« Reply #42 on: January 13, 2012, 09:10:10 PM »

IZRSSS,

Here is a pic of the firewall to sub frame strap.  My '69 Z28 is a Norwood built first week of May (05A) with a U79 "Blue Light" AM/FM Stereo, 4-speaker system with the multiplex-amplifier, shown on page 445 of the AIM.  I purchased the car with about 45K original miles and restored it.  It had all (4) ground straps which I still have.  I attempted to clean and reuse the straps but they did not clean up to like new condition so I replaced them.  The capacitor (fan blower noise suppressor) in the picture is detail #2 shown on page 439.  Note that it states “ALL EXCEPT C60” for air conditioning and includes the body to frame ground strap.

I also included a picture of the Inner Fender Well (skirt) to Frame strap shown for an L-6 engine car on page 441.  My car is obviously a V-8 car but it did originally include all (4) ground straps.  The "E" head screw with star lock washer was on the strap in frame position so I reused it.  All the other screws that go into sheet metal are replacements offered by AMK, #B-11099, 1/4-14 x 5/8” screws, Zink plated with a "D" mark.  These are the #9420415 called out in the AIM.  Note that the screws that go into the frame are #9420152.  I can not be sure if the “E” mark screw I have is original.

Does anyone have an original U79 Radio car build about the same time period as mine with the original ground strap screws still in place in the frame positions?  Are they like the “E” head screw?  I would love to see a picture!

Thanks.

Dave
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IZRSSS
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« Reply #43 on: January 13, 2012, 09:58:05 PM »

Again...great pics guys & excellent explaination Dave.

Dave - I might be able to help out. I do have RPO U79 (Blue Light Stereo) and thanx to you all's explaination and pics I managed to locate mine. It was hidden underneath the evaporator. I also have reason to believe its the original strap (it's the only one of 4 attached to the car). I'll jack the car up over the weekend and see if I can get better pics including the fasteners.

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IZRSSS
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« Reply #44 on: January 14, 2012, 07:27:56 AM »

Does anyone have an original U79 Radio car build about the same time period as mine with the original ground strap screws still in place in the frame positions?  Are they like the “E” head screw?  I would love to see a picture!
Thanks.
Dave


Dave - Here is the cable and fasteners that came with U63/A7 (lower left pic/illustration). I also located the left body to engine strap & the fastener on it (firewall/body) is the same. I also think I can see enough of Steve's fastener to say ours are the same.

LA Build (12A)

Hope this helps...
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