I have had this problem Mike and i recomend you bin it.
They say they are rated at 20Amp but this it nonsence. i used mine at around 5 Amps (1 charger and 1 equaliser) for about 6 month and it failed. I took it to bits and found that there is a ferite core with 13 varnished copper windings through it and what happened was these get hot (even at 3 Amp and with the useless fan in the power supply) when hot, gradually the varnish on the windings breaks down and they short out killing the main transformer. 1 have rewound mine once and its now only a spare.
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