When I set up my electrolysis rig, I put an ammeter in series with the low voltage wiring so that I could monitor the action. The removal of rust is roughly proportionate to the current flow. When crud gets deposited on the sacrificial electrode or electrodes, the current can drop to almost zero. Then it’s time to clean the electrodes and get back to work. The ammeter shows when It’s time to clean.
You might have an automatic charger. After you hook it up you should get an amp or two or even more flowing through your electrolysis tank. If not, it might be due to the automatic function. As said earlier by nadogail, if that happens, just put a 12 volt battery in parallel with the charger and run like that.