thank for the info Dieselnut, but not the problem is not quite as you described.
When this additional light is connected up the brake and tail/index lamp are wired in parallel with the existing wiring.
When the brake light wire is connected to the existing brake light wire the tail light goes out. This is without the brake light being operated. Strangly the number plate light stays illuminated. Its on the same feed wire so this is illogical.
So as per original post its although there is a logic gate on the brake light wire that is detecting a filament and earth behind it and killing the tail light.
Wierd or what ???
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