On Sun, 2 Jan 2011 15:33:02 -0800 (PST), Andy Dingley
wrote:

On Jan 2, 11:15*pm, "John" wrote:

...or good earth contacts to the bulb caps.

A bulb with a failed cap contact just goes out.

A cluster with a failed earth to the cluster shows ghost ilumination
through other bulbs (usually stop or fog, as they're the lowest
impedance)

Impedance? Are we talking AC car batteries here? ;-)))

--
Frank Erskine