Within a minute of turning of the engine there starts a significantly loud noise tack, tack; tack coming from the ABS box. No warning lights or codes; no problems with braking or noises whilst driving.

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Problem began on Saturday, after battery had been disconnected and reconnected to a new alternator. Left the car overnight, thought the noise had stopped; by morning battery was dead as a dodo. Recharged battery, moved car; stopped, noise starts again; when battery put on charge noise stops. Help please, anybody.