Hello
I saw this thread and asked my partners advice as he instals audio equipment, his reply was " use a 5watt sidelight bulb connect the earth from the battery to the cap and wire the 5w bulb in series between the positive battery terminal and the positive terminal on the cap, once the bulb goes out, your cap is fully charged, doing this without the bulb or resistor will damage your cap"
Hope this helps as i have no idea what that meant
Tara