I need a 12 volt DC power supply with adjustable amperage from 2-10 amps?

OK, I’m working on a hydrogen generator and I was using my old vintage 12V. Battery charger to generate hydrogen. This worked fine until my battery charger gave up the ghost and will no longer function in the 2-10 amp range. It has a “Hot Charge” option that goes to 60 amps which is way too much for the lead conductors that the charger clamps to. That amount of amperes causes them to get red hot, and we can’t have that kind of thing happening inside of the generator cell. So now my problem is, does anyone know where I can get a 12 V. 2-10 adjustable amperage, power supply?