We often have discussions regarding the location of ground straps and the fact they can often cause electrical failure when not attached or not securely attached. Below is a run-down of the ground straps used. This post will be updated with additional pictures and info in the future and will be added to the Help Topics page.

Negative Battery Cable
These originally came with spring ring terminal type cables, but have often been replaced with bolt terminal cables over the years. Either type is fine, however, you need a clean tight metal to metal connection as with all ground connections!
Below is a picture of a original type spring ring terminal negative battery cable.

Below is a picture showing an original type spring ring negative cable with the short braided harness that attaches to radiator support:

Negative Battery Cable to Frame and Radiator Support
Battery cable negative to frame and short braided harness from bottom of battery cable to radiator support..where you have lots of electronics attached to or feeding through.  I often see newer bolt terminal cables installed on these cars with no ground back to the radiator support and wonder if that degrades the current flow.

Picture below shows the bottom of the negative cable connected to the frame; the short braided ground strap attached to radiator support. You can also see in this picture the right/passenger side forward lamp harness small ground wire attached to the frame all in that same picture.  That's 3 grounds in one area.



Right Frame Rail to Engine:

Very large heavy gauge ground strap from right frame rail just underneath the firewall cowl area, over to engine block at transmission. This is the main culprit for ground related starting problems. Here is a picture mounted on the frame which is just above the front transmission cross-member location:

Forward Lamp Harness to Frame
just in front of the radiator support on both left and right side (will cause headlights to not work. See picture above for example of Right side and the picture below of Left Side which is just beside the VIN # stamped on front frame rail:

 

Left and Right Cylinder Head to Firewall/Cowl Ground Straps
One ground strap from back of each cylinder head to firewall/cowl. 
See pictures below:

RIGHT SIDE CYLINDER HEAD TO FIREWALL:
LEFT SIDE CYLINDER HEAD TO FIREWALL:


Voltage Regulator Harness to Radiator Support
Small black ground wire mounts thru lower left base of voltage regulator bracket to radiator support.

Antenna Cable Ground

Attaches to firewall on lower right side near where cable comes through firewall. 


Dash Harness Ground
The dash harness ground wire attaches to the metal dash framing at the section of the dash near the center that attaches to the firewall.

Several Other Smaller Ground Straps
 There are many other grounds throughout the car such as the  AC compressor to water outlet pipe cover bolt, wiper motor to attaching bolt, power seat motor to seat rail, fuel sending unit to frame, front upper control arm to frame, etc. Also the relays such as horn, seat/window (on 64), etc generally complete the "control/feed" circuit by way of ground to the body somewhere.

Views: 3413

Reply to This

Replies to This Discussion

Awesome Jason!  Thanks for the info...

Thanks, Todd. I just added 5 new pictures, 4 from the current parts car, showing additional ground strap locations.  The forward lamp harness and cylinder head to firewall show a lot of corrosion built up over 50+ years and one reason why these need to be inspected, cleaned, and reinstalled to make sure you have solid metal to metal contact. 

Can someone post the location on the engine where the right frame rail to engine attaches on the engine? I seem to not have that ground. Could be one of the issues with my starter

The ground strap is attached to the flywheel housing --just in front of the starter --where the starter bolts into it --on one side of the ground strap
The other side of the strap --is bolted to the the right side of the frame rail

It is a bit of a difficult picture to take when you get one side of the strap you cannot see the other side of it from the photos of that strap i have viewed

Enjoy

Another ground you would want to be very clean --is the ground on the regulator to help keep the charging system working reliably

Enjoy

RSS

Photos

  • Add Photos
  • View All

Forum

Hey Jason,

Started by Kevin Campbell in General Discussion. Last reply by Kevin Campbell 35 minutes ago. 10 Replies

Have you done Dino's lifters yet?Continue

Clutch fan?

Started by Jeff in 1963/64 Cadillac Specific Discussion. Last reply by Russ Austin 7 hours ago. 10 Replies

having a tough time finding a clutch fan that fits.  Got the one from napa that they had listed for a 64 but the hub is to big (2.600), the hub on my original one is 2.400.  I ordered one from rock…Continue

Finally a solution!

Started by Leif Gammelgaard in 1963/64 Cadillac Specific Discussion. Last reply by Russ Austin 8 hours ago. 1 Reply

Hi!Finnish Transport Safety Agency sent an acceptance one hour after I added my message here! This means that my car can be registered in Finland. Hurray!Continue

Eldorad information - number 2

Started by Leif Gammelgaard in 1963/64 Cadillac Specific Discussion 10 hours ago. 0 Replies

Hello again!Thank you all for your comments regarding the registration of my Eldorado! DMV cannot help, nor their Information Service Unit. The situation at the moment: if I can prove that the…Continue

Blog Posts

Original 64 Color sanded and buffed out

Posted by Norman Silverman on November 10, 2018 at 9:05pm 14 Comments

I finally got the car back from the body shop, where they color sanded and polished it out. I am literally blown away by the result! Now, it looks great from 2 feet but if you look REALLY CLOSE you can see that the paint is not as glossy as it should be, but Sothe end result is much better than what I started with. The interior is still original.

Norm

PS…

Continue

Transmission mounts

Posted by steve white on October 31, 2018 at 6:06pm 3 Comments

Hi all im trying to find out about the transmission side rubber mounts on a turbo hydramatic in a 1964 cadillac coupe deville what are they called and where could i get some i am based in australia

Dustless blaster

Posted by Kurt on October 30, 2018 at 12:23am 1 Comment

Here's something cool I stumbled across on Youtube. Pretty cool. It's like a power washer with sand.

https://youtu.be/YQ7CFGIP4uk

Source for Replacement Radiator for my 64 with AC

Posted by Norman Silverman on October 29, 2018 at 2:33pm 5 Comments

I want to replace the radiator in my 64 DeVille. 

Which vendor is a good source for an OEM type unit?

Thanks

Norm

Videos

  • Add Videos
  • View All

© 2018   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service