[GreenKeys] WU 28ASR WIRING

[Jim Haynes]

On Sat, 13 Feb 2021, w9ddd at tapr.org wrote:

> Hopefully someone knows more about this than I can seem to remember.   Seems
> like there is something about the chemistry of wet cell batteries that lead
> to telephone and telegraph systems connecting the battery + terminal to
> ground.  I remember that British cars used positive battery ground at one

I think this has something to do with corrosion.  See electroplating.
The negative electrode attracts metal ions, whereas the positive electrode
pulls them away from the metal, eating away at it.