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Old 01-11-2011, 11:40 PM   #1
Jack Wood
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Default How many and where should ground wires or ground straps be?

Tell me: what are the best or correct locations for ground straps etc. to avoid electrical gremlins? With a used car, the straps are missing, eat up, etc. I want it to be right.
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Old 01-12-2011, 01:19 PM   #2
bobs77vet
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here is what comes to mind without thinking about them on a 77

1: from engine above the strap that holds starter in place to the frame horn by fuel pump

2: front radiator inner core support (drivers side) to headlights loom this is well hidden

3: above starter on trans case for wipers coming from the starter wiring loom

4: from battery to frame behind drivers seat

5: rear area behind the bumpers in the middle of the frame connector above the spare tire carrier

6: at least one in the instrument panel i think it was by the headlight switch
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Old 01-12-2011, 01:36 PM   #3
Scott Marzahl
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Hi Bob, how's that '77 running?

Bob is right on the money, you might want to inspect or install new starter to frame grounds and the battery ground, they tend to corrode inside and not be visible. My local Napa will build up new cables pretty inexpesive and better than off the shelf generic cables.
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Old 01-12-2011, 01:46 PM   #4
Alan 71
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Hi,
My 71 has a long ground-strap from the antenna mount to the frame rail. Was that still around in later years?
Regards,
Alan
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Old 01-12-2011, 01:50 PM   #5
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Good catch Alan, yes from the antenna mounting plate to the frame as well.
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Old 01-12-2011, 02:07 PM   #6
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Hi Scott life is good and the car is running well, latest tinkering has been fitting a later model dual tunnel cold air intake to the car. it actually makes a noticeable difference. take care bob
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Old 01-12-2011, 02:08 PM   #7
noonie
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Some of the grounds just use sheetmetal screws for attachment which after years are virtually useless. You can thread those and use a real bolt. Copper antisieze or dielectric grease helps against oxidation.

The birdcage groundstrap is visible after removal of the drivers front splash shield.
Should also be one on the headlite header.
Then interior wiring gets it's ground from the drivers door pillar point above the lower dash. The wire extends from there to the clusters and console.

Redoing all the grounds points is the best place to start for prevention and testing.
I also add a #6 cable form the alternator to the frame directly below.
Extra grounds don't hurt.
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Old 01-12-2011, 02:11 PM   #8
Manuel Azevedo
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Good grounds are a must for good operations of the electrical system on any car, but without everyone trying to come up and list various grounds needed I would suggest one get a copy of the ASM for your given year car and I believe you will find all the grounds as used by the factory and their locations.
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Old 01-12-2011, 03:40 PM   #9
dembo
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Hey,
In my thread below I tried to take pictures of all the grounds on my 74. Two pictures are missing : the ground strap to the antenna plate and the one on the lh kickpanel for the dash. Hope it helps
Nick
http://forums.corvetteforum.com/c3-g...r-rebuild.html
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Old 01-12-2011, 04:03 PM   #10
Easy Mike
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In addition to those already mentioned, the main dash harness grounds on the driver's door hinge post.

Purchase the assembly instruction manual (AIM) for your model year. The AIM shows all the straps and grounding points.

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Old 01-12-2011, 04:10 PM   #11
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Engine bay main harness ground there is a post in the corner of the plenum for the AC, the main harness, blower motor, wiper motor and a braided strap to the upper rear valve cover all go there.
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Old 01-14-2011, 11:20 PM   #12
C3batmobile
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Default Anyone with more ideas on 'auxilary' grounds

Thanks for all this great info on grounding. I'm planning to check & repair all the ones in the ASM for my '69 Coupe and I'm interested in possibly adding some additional grounds. One side of my gauge cluster metal is broken and I've read where this can affect the ground for the wiper switch. I'm also planning to install a new sound system, so ideas for good grounding of the dash & console will be appreciated.

My voltmeter is showing '0' most of the time, but a slight discharge while driving with the headlights on (more so with the brights on), so I'm also planning to troubleshoot & maybe upgrade my charging system. Any additional ideas on this would be appreciated too.

Sixfooter - thanks for the braided strap from the blower case to the engine. I'm not certain yet but I think my ground that should be on a back mounting bolt for the starter solenoid is instead on the ground on the blower case. Connecting that blower motor ground post to the block would be good for mine even after I am able to get underneath (so far my jack and stands can't get her high enough for me to get under).

Even with just a standard 'rebuilt 350' and a Q-jet, this car is as least as much a blast to drive as I ever imagined (of course). As I learn more about these great cars, I will look for threads where I can be helpful in order to give back for the great information and help I have been finding/receiving on this forum. Everyone's generosity with their knowledge is really a tremendous thing here.

Loving my new 'dream car' - smiling more these days !


Last edited by C3batmobile; 01-14-2011 at 11:59 PM. Reason: typo - then I added 'context'
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Old 01-14-2011, 11:20 PM
 
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