In sci.electronics.repair on Tue, 02 Aug 2005 10:13:11 -0500 Mike
Berger posted:

Typically it's the one you connect to the negative side of the
battery.

Funny, but no. But Someone gave me a good answer.

meirman wrote:
I have an expensive auto compass with a wire in which both halves are
black, but one side is marked with grey or white rectangles. Which
one is supposed to be the ground? (I've lost the instructions.)
==============


Meirman
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