My car wont start, after being put in the garage engine running perfectly 3 months ago. There is no spark at the plugs, Car fitted with a Sigma Thatcham cat 1 alarm/immobiliser 2 years ago, normally very reliable. Engine spins fine but no sign of starting. Plan to look into alarm immobiliser first by checking if 12V supply to coils is ok, then to look into sensors/Electrical control unit. Does any one have any other suggestions or able to confirm my logic in checking the system out. Thanks, Gareth