Where are the chassis earth points on a cav engine bay?

Post queries regarding your Mk3 Cavalier's ICE and electrical components (head units, wiring, retro-fit toys, upgrades etc.) here

Moderator: Robsey

Post Reply
User avatar
Gaz
Registered user
Posts: 6985
Joined: Sat Sep 22, 2007 1:05 pm
Location: Manchester

Where are the chassis earth points on a cav engine bay?

Post by Gaz »

Where are the chassis earth points on a cav engine bay? Im thinking maybe ive missed something somewhere.
Image
vauxtillidie
Registered user
Posts: 849
Joined: Sun Nov 22, 2009 8:24 pm

Re: Where are the chassis earth points on a cav engine bay?

Post by vauxtillidie »

to the right of the battery? could try earthing different points on engine using a jump lead onto neg on battery
2006 Flame Red Astra VXR 19's, AFL, Headlamp Washers, Cruise Control, CD70+ AUX In, CID, Bluetooth, Sight & Light, Powerfold Mirrors, DDS/TPMS, Park Pilot, Check Control, Speed Locking - All Retrofitted by me :)
User avatar
Envoy CDX
Club Admin
Posts: 9690
Joined: Sun Sep 23, 2007 3:51 pm
Location: Jarrow, Newcastle Upon Tyne

Re: Where are the chassis earth points on a cav engine bay?

Post by Envoy CDX »

From memory, theres only 1 earthing point on the Cavs in the engine bay (hence crap charging / poor headlights.

I've started moving my earths to different points now.
Check the Rules!

Raw 8v Power! - Bad Cav, Naughty Cav... Cav want's to do 90!

The How2 Index
User avatar
Robsey
Club Admin
Posts: 10640
Joined: Fri Dec 12, 2008 1:42 pm
Location: East Manchester

Re: Where are the chassis earth points on a cav engine bay?

Post by Robsey »

Definately one big one next to the battery. (for the high consumption stuff)

Although I do believe there is a smaller ground connection behind the engine (base of cylinder head, near to cam sprocket end)
And also there should be a bunch of smallish ground wires near the wiper motor connection in the scuttle panel.

On my old Mk 2 there was also an earth link from the alternator to it's metal mounting strap at the cylinder head end.

There is a big earth to the bell housing of the gearbox, from the battery negative terminal. (upper flange area just below the distributor) on straight four engines.
Dieselicious
Registered user
Posts: 160
Joined: Thu Aug 26, 2010 10:10 am
Location: West Sussex

Re: Where are the chassis earth points on a cav engine bay?

Post by Dieselicious »

Envoy CDX wrote:From memory, theres only 1 earthing point on the Cavs in the engine bay (hence crap charging / poor headlights.

I've started moving my earths to different points now.
Any feedback to give??
From the moment I picked up your book until I laid it down I was convulsed with laughter
Some day I intend reading it
'95 TD LS
'85 Monza GSE
'92 Senator 12v Auto
'99 Omega 3.0 MV6
'99 Omega 3.0 MV6 (Ex-Polizei)
User avatar
Envoy CDX
Club Admin
Posts: 9690
Joined: Sun Sep 23, 2007 3:51 pm
Location: Jarrow, Newcastle Upon Tyne

Re: Where are the chassis earth points on a cav engine bay?

Post by Envoy CDX »

Dieselicious wrote:
Envoy CDX wrote:From memory, theres only 1 earthing point on the Cavs in the engine bay (hence crap charging / poor headlights.

I've started moving my earths to different points now.
Any feedback to give??
Other than keeping them well covered in coppergrease to stop the bare metal rottening nothing much. no real difference in lighting on the headlights, but I am going to relay them at some point (I keep saying I will, but havent yet for 1 reason or another).
Check the Rules!

Raw 8v Power! - Bad Cav, Naughty Cav... Cav want's to do 90!

The How2 Index
User avatar
Robsey
Club Admin
Posts: 10640
Joined: Fri Dec 12, 2008 1:42 pm
Location: East Manchester

Re: Where are the chassis earth points on a cav engine bay?

Post by Robsey »

Righty-oh...
I've been cleaning up my earth tags on my car, and there are 4 distinct earth points. (On my C18NZ pictured, I have points 1 to 4)

I'm sure V6 will be totally different. They always are !!

1) On the back of the cylinder head - behind No 1 cylinder - earth for injector and other Throttle body bits.

2) On the passenger side inner wing

3) Sometimes theres an earth near to the wiper motor, under the plastic panel

4) On the distributor end of the engine near the back - Big brown cable that links directly to the batery -ve post

5) On some cavaliers, there is an earth tag on the gearbox - either bell-housing bolt, or on the gearbox end-plate

6) and if you are being pedantic - the battery -ve post itself.
engearths.JPG
Post Reply