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Discussion Starter #1
Hi looking for some advice\help my son's 1.8 Vectra C is draining the battery. The battery is good it is only 6 months old.

I've put a multimeter on the battery and with the engine off and the car locked with the central locking it is drawing 3.6 amps.
I pulled the radio and disconnected the bulb in the glove box I've pulled all the fuses and relays (1 at a time) also disconnected the ecu and the alternator and it is still drawing 3.6 amps.
Any ideas on what couldbe the problem would be appreciated.
 

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Try disconnecting the main (battery) wire on the alternator and testing the drain again (make sure it doesn't short to earth though).
 

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Discussion Starter #4
Checked the starter motor today and went to disconnect wiring and the big cable 13mm nut was loose I could undo it with my hand, I took the cable and the small cable off and checked the battery was only drawing about 0.6 amp.
I reconnected both cables on the starter motor and checked again and it was drawing about 1amp so a lot less than the 3.6 amps.
Hopefully this was the problem should find out in the next couple of days.
 
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