Trik-L-Start device gets power from the converter/charger and needs the rig to be plugged into shore power to send some charging current from the house battery to the starting battery via a wire to the starting battery positive terminal.
Many/most rigs have no provision to charge starting battery when engine is not running. If you have no power available in storage, remove house and starting batteries and connect to "smart" trickle chargers where you do have 120vac power available. Check electrolyte levels every month or so and add distilled water if needed to cover the plates. Most batteries self-discharge over time when not connected to anything. "Battery Minder" chargers have a desulphation mode which can (supposedly) restore batteries to near new capacity over time.
