Ummm ... personal opinion only ; if the below review is actually correct, how about return to sender as being unfit for duty due to false advertising wrt the item description?
NOT 40 Amp, more like 20 Amp at best!!
The ammeter on this charger is wrong!! After purchasing another (matched) shunt and ammeter, we were able to prove this unit was only capable of outputting 15-20 Amps at best! Two seperate ammeters were used to confirm the low output. It appears either the face of the ammeter has been replaced with a higher reading face to make it look like a 40 Amp model, or a deliberate mismatch of shunt/meter to make it look like a higher reading on the dial. Even at only 12 Amp output, the unit overheats in under 10 minutes, and requires the cover to be removed and have a fan blow on it constantly to get any continuous use from it. The lugs connecting to the back of the switches are loose fitting, and one had come off in transit, requiring dismantling and repair before first use. This unit could suffice as a 10 Amp charger for a car battery perhaps, but is useless as a serious high power charger. It is NOT a smart 3 stage charger AT ALL!! It is a simple transformer/bridge rectifier. No filter capacitors, no control circuits. I figured for the price it wouldnt be a 3 stage (which I didnt require anyway), but I have seen it advertised as such, and it definitely is NOT!! Casing is robust and the only “good quality” part of it.
For mine, that's seeming to correlate with your experience all too coincidentally identical?
ref.
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