That Sears charger of yours is a jewel. It will work fine.
You have to put your RV electrical in hibernation while doing a desulfation.
- Charge up batteries as far as you can with your converter
- Then disconnect AC power to your rig OR manually shut down all charging sources
- Manually shut down all loads even the refrigerator
- High battery voltage can damage some expensive stuff
- Set your Sears charger to 10 amp setting
- Remove all battery caps
- Turn charger on
- Take a peek at the liquid in all 12 cells
- Not bubbling, right?
- Leave the charger on until all 12 cells in your bank are bubbling
- If one battery has cells that do not bubble shut charger down and isolate that battery by disconnecting it's main ground cable
- Use the battery that bubbled to power the coach while you concentrate the charger power on the stubborn battery
- If it takes three hours to get the stubborn cells bubbling so be it
- When the cells bubble the battery is fully charged
- Bubbling does not mean an occasional bubble it means constant bubbling
- How long did this take?
- The longer it took the worse the state of the battery was
