On 02/01/2011 23:33, Andy Dingley wrote:
On Jan 2, 11:15 pm, 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)


The same thing can happen with a dual filament bulb if the cap isn't
earthed to the cluster.
--
Cheers,
Roger
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