Ferrino
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| posted on 18/3/06 at 10:13 PM |
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Chassis Earth Points
Is it OK to have multiple earthing points on the chassis (ie. using the chassis tubes to carry current back to the battery)? I hear of so many
electrical gremlins linked to poor earthing.
I was thinking of having 3 points - one at the front for headlights+fan, one under the dash for instruments, and one at the back for fuel pump +
lights.
Or do some people do without chassis earthing altogether and run cables all the way to the battery?
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bigrich
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| posted on 18/3/06 at 10:19 PM |
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i have an earth point in every corner and one behind the dash plus the battery -ve earthed to the chassis. no problems yet,used m6 nutserts for earth
points with bolts and ring terminals.
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smart51
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| posted on 18/3/06 at 10:19 PM |
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I have an earth point at the back for rear lights and fuel level sensor. It is quite common. No problems yet.
There is so little extra effort in fitting a bit of wire into the loom that I wonder why looms are made without them. The hassel of drilling and
tapping a hole in the rear of the chassis is easily outweighed by running a 2 metre length of wire back to the battery.
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omega 24 v6
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| posted on 18/3/06 at 10:40 PM |
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You could always have an insulated return system where all earths come back to the battery. When I say all i mean all the main one/s which are joine
to many minor ones with heatshrink terminals and sleeving.
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nitram38
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| posted on 18/3/06 at 10:48 PM |
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quote:
Originally posted by smart51
I have an earth point at the back for rear lights and fuel level sensor. It is quite common. No problems yet.
There is so little extra effort in fitting a bit of wire into the loom that I wonder why looms are made without them. The hassel of drilling and
tapping a hole in the rear of the chassis is easily outweighed by running a 2 metre length of wire back to the battery.
You would have to double the amount of wires or use a very large single cable. It is simplier to use the chassis.
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k33ts
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| posted on 18/3/06 at 11:59 PM |
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i agree with nitram the chassis is the biggest conducter why not use it, plus if you run seperate earths youve got twice the chance of getting a fault
and twice the headache trying to find it.
weld a bolt m6 to chassis in the points you mentioned and one near the battery for the earth neg supply.
nitram have you got your cat 2 yet?
let us know when you have and ill tell you what and where.
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nitram38
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| posted on 19/3/06 at 12:15 AM |
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K33ts, I sent you a u2u.
Can you email me the details before I buy?
It will probably be a Toad!
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wilkingj
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| posted on 19/3/06 at 09:06 AM |
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I would use at least an M8 bolt for the Main Battery to Chassis connection.. Remember there is 200-300 Amps flowing when starting. IMHO M6 isnt
enough. ie you want a good sized ring tag suitable for the large current flow (worst case).
I welded a bit of 3mm Angle Iron to the chassis with a M8 hole in it. Hmmm That might have even been a M10
 
Earth Lug (My Welding!!!)
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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britishtrident
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| posted on 19/3/06 at 09:18 AM |
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Through the chassis is the normal way
Earth points at both front corners.
Main earth point in engine bay -- for engine. battery and ECU earth -- use a tag strip with two holes -- one for the main heavy duty connections the
other for the ignition.
Earth point under scuttle for instruments.
Earth points at both rear corners.
[Edited on 19/3/06 by britishtrident]
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smart51
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| posted on 19/3/06 at 01:28 PM |
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quote:
Originally posted by nitram38
You would have to double the amount of wires or use a very large single cable. It is simplier to use the chassis.
You will only have to use 1 wire for the earth. The one wire won'y ahve to be too thick. IT has to carry the current of all your rear lights
at once. About 5A? A bit more to be on the safe side. No problem.
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Ferrino
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| posted on 20/3/06 at 12:12 PM |
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Thanks guys! I will stick to the original plan of using chassis earthing points at front, rear and under dash.
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