My flasher relay buzzes when I reconnect the battery after a period of lay-up. Now, I understand this may be due to low voltage, failing relay, or something else, and a new flasher may fix the buzzing. But does this buzzing as I reconnect the battery mean that the relay is permanently energised whenever the car is switched off and immobilised? Is this another source of battery drain in addition to the immobiliser? The car is a Sigma 125. Richy