Big boomer and Ronnie
Many thanks for your input. The auto electrician did exactly that and the “parked” mode reading was 50mA which he said was normal for a car/battery of this size, before this parked reading it measured 1.7A which made me think I had a drain. Both “experts” said there was no drain and car was tested with lights heater fan etc on and the reading was I think 14v which they said confirmed the alternator was working fine.
Would taking out the 20A DC OUT fuse when car not used prevent a drain?
As you both suggest the radio/CD/Amplifier may be the source of my problems.
I know nothing of car electrics but if no joy removing fuses what is the function of relays, are they basically an on/off switch.?
If amplifier is draining the battery wouldn’t that have shown up in the battery drain procedure stated by Big Boomer. The auto electrician said with the 50mA draw the battery in theory should run flat in approx 50 days if not used.
Thanking you both for your help in this matter