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Update:
My previous posting of current readings are wrong!
The culprit is the fuse on the red alligator clip. I opened it up and the damn fuse was only rated 20A and some reason causing a bit of resistance too! Where I got it from says it's rated 120A - probably the cable/clips not the fuse.
So I decided to cut it off as the PSU has protection anyway and now the reading is easily over 20A just putting the car in ignition with lamps on. It was only reading around 5-8A with ignition on before.
So please ignore my amp readings previously. It's why my battery was drained.
Picture attached with just car ignition on with radio, vent and lights on. Easily over 20A....
If ur building PSU perhaps don't use those in-line fuses.
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