<<Presumably because the radio, or speakers, or both, are grounded through
the case, or at least are not insulated against being grounded through
the case. But don't take my word for it -- go ahead and buy an expensive
CD player, and then let the shop's installer tell you "no way"...>>
Correct - most do ground throught the case. Some 60s units did not, and had
little grounding switches that could be set either way. You can also fit a
negative ground unit to a positive ground car, as long as the chassis _never_
touches the car.
But why bother- just switch to negative ground - the only cars where this is
even a little hard are the 65 - 68 ones with electric tachs; the rest can be
done in 5 minutes.
Bill S.
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