In rec.autos.makers.honda remcow <whybcuz@yahoo.com> wrote:
> For instance, if you need ground/power for a two way FM radio, the best spot
> is the ground/power lug of your battery. Tapping it anywhere else and you'll
> have currents with other devices in common. Quite often you'll hear the

That reminds me of a point that I was going to make in response to the
subject line, but I got distracted by the content ;-)

How ground is ground? Not very.

In high powered radar systems, it was common to run a scope probe along the
edge of the chassis, on "ground", looking for signal. When you didn't see
any, you were at the failed stage of the amplifier.

Ground in automobiles is a nebulous thing. Watch the brake lights and
taillights that have strange interaction on almost any Volvo, and some
Cadillac Sevilles. As the driver steps on the brake, the taillight goes
out and the brake light comes on. "poor ground".

"The chassis" is probably a good ground, but that's sometimes hard to
locate. I can't recall which car I was trying to work on... Even the
metal parts of the dashboard weren't grounded well.

On the Honda Civic, there are huge reinforcing bars in the dash, that I
would assume were a good ground, and the return wire for the accessory
outlet bolts to that.

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Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8-122.5