Electrical grounding wire?

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Old 14 Oct 2003, 08:30 am   #1 (permalink)
Daniel M. Dreifus
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Default Electrical grounding wire?

1994 Camry 4 cylinder - right (US passenger side) front fender, about
six inches behind the headlight is a wire poking up in the air with a
flat metal termination with a hole (as if for a bolt) through it.
Wire is white with a black stripe.
On the fender nearby is a threaded hole with original body color
factory paint.
Near as I can determine from the wiring diagram, all white wires with
black stripe are for ground - but none are shown on the diagram apart
from left side.
Anyone else have this unconnected wire?
For some accessory I don't have, or bolted to the fender for a ground?
The wiring is so thoroughly designed, even including reinforcement
where the cabling runs through the body, seems odd that this single
wire is poking out.
I realize this probably won't happen, but was hoping if this wire
should be grounded, might help reduce static on AM radio band (noise
suppression capacitor near the coil checks fine.)
Don't want to bolt this wire to the fender if it carries current for
some other purpose.
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Old 14 Oct 2003, 10:13 am   #2 (permalink)
Jason James
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Default Re: Electrical grounding wire?


"Daniel M. Dreifus" <nospampls2002@yahoo.com> wrote in message
news:c5ef7dc0.0310140530.20403400@posting.google.c om...
> 1994 Camry 4 cylinder - right (US passenger side) front fender, about
> six inches behind the headlight is a wire poking up in the air with a
> flat metal termination with a hole (as if for a bolt) through it.
> Wire is white with a black stripe.
> On the fender nearby is a threaded hole with original body color
> factory paint.
> Near as I can determine from the wiring diagram, all white wires with
> black stripe are for ground - but none are shown on the diagram apart
> from left side.
> Anyone else have this unconnected wire?
> For some accessory I don't have, or bolted to the fender for a ground?
> The wiring is so thoroughly designed, even including reinforcement
> where the cabling runs through the body, seems odd that this single
> wire is poking out.
> I realize this probably won't happen, but was hoping if this wire
> should be grounded, might help reduce static on AM radio band (noise
> suppression capacitor near the coil checks fine.)
> Don't want to bolt this wire to the fender if it carries current for
> some other purpose.


Cars have many earth-points to guard against poor regulation of the earthing
system ie if all the current which flows in the cars +12v went to earth thru
one point (especially where there's a lot of plastic), there would be an
opportunity for alternative 'soft earths' to also carry some of the combined
current which causes wierd effects such as dimly glowing alarm lights,..so
the more eaths the better.

You could use a digital ohm or continuity meter to check that this wire IS
an earth wire. It should show essentially less than 0.05 ohms when one lead
is connected to the wire in question and the other the body of the car. Good
connections are essential when doing this test.

Jason


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Old 14 Oct 2003, 04:46 pm   #3 (permalink)
Daniel M. Dreifus
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Default Re: Electrical grounding wire?

"Jason James" <flyhi@byplane.com> wrote in message news:<voUib.150896$bo1.27797@news-server.bigpond.net.au>...

> You could use a digital ohm or continuity meter to check that this wire IS
> an earth wire. It should show essentially less than 0.05 ohms


Looks like the reading is 130 ohms, so I'll just leave that wire
alone, rather than attempting to ground it.
Used a digital multimeter, which I purchased for accurate readings vs.
my old analog VOM.
The readings jumped around a bit, staying at zero for a while, but
when I put the wire terminal on the plastic case and pressed with the
meter lead to create good contact, the reading was 130.
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Old 14 Oct 2003, 07:06 pm   #4 (permalink)
BLimey
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Default Re: Electrical grounding wire?

Daniel,

I have the same year car with the same engine. I just ran down and checked
mine. You described it very well. It is a part of the wire harness and on my
car the white/black wire does screw into the frame/gnd. Contact me offline
if need be and I'll send you a digital pic....

BLimey


"Daniel M. Dreifus" <nospampls2002@yahoo.com> wrote in message
news:c5ef7dc0.0310141346.7f55a239@posting.google.c om...
> "Jason James" <flyhi@byplane.com> wrote in message

news:<voUib.150896$bo1.27797@news-server.bigpond.net.au>...
>
> > You could use a digital ohm or continuity meter to check that this wire

IS
> > an earth wire. It should show essentially less than 0.05 ohms

>
> Looks like the reading is 130 ohms, so I'll just leave that wire
> alone, rather than attempting to ground it.
> Used a digital multimeter, which I purchased for accurate readings vs.
> my old analog VOM.
> The readings jumped around a bit, staying at zero for a while, but
> when I put the wire terminal on the plastic case and pressed with the
> meter lead to create good contact, the reading was 130.



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Old 16 Oct 2003, 12:52 pm   #5 (permalink)
Jason James
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Default Re: Electrical grounding wire?


"Daniel M. Dreifus" <nospampls2002@yahoo.com> wrote in message
news:c5ef7dc0.0310141346.7f55a239@posting.google.c om...
> "Jason James" <flyhi@byplane.com> wrote in message

news:<voUib.150896$bo1.27797@news-server.bigpond.net.au>...
>
> > You could use a digital ohm or continuity meter to check that this wire

IS
> > an earth wire. It should show essentially less than 0.05 ohms

>
> Looks like the reading is 130 ohms, so I'll just leave that wire
> alone, rather than attempting to ground it.


Sounds a bit like its not part of the multiple earth system. It maybe the
earth for a relay or some feature the car has which would now not be
working??

> Used a digital multimeter, which I purchased for accurate readings vs.
> my old analog VOM.
> The readings jumped around a bit, staying at zero for a while, but
> when I put the wire terminal on the plastic case and pressed with the
> meter lead to create good contact, the reading was 130.


May have volts on it as well,...did you check for volts?

Jason


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Old 16 Oct 2003, 04:25 pm   #6 (permalink)
Daniel M. Dreifus
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Default Re: Electrical grounding wire?

BLimey wrote:
I have the same year car with the same engine. I just ran down and
checked
mine. You described it very well. It is a part of the wire harness and
on my
car the white/black wire does screw into the frame/gnd. Contact me
offline
if need be and I'll send you a digital pic....

Got the photo, double checked the wiring diagram - seems like white
with black stripe is a convention for ground in most all of the wiring
diagrams.
Went ahead and bolted the wire to ground and a license plate light
went out - but turned out to be coincidence only.
Today I purchased aligator clips for the digital multimeter leads -
without them could never be sure I was getting accurate readings by
pressing the sharp point of the leads to a contact.
Anyway, no blown fuses, wire didn't heat up and fry to a crisp, all is
well.
Still a mystery why that wire was left dangling, but seeing the photo
confirmed my guess that it did in fact go to ground.
Thanks for your suggestions. Looks like I'm all set.
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