Greetings, In our battery box is a small metal box into which a plethora of wires enter. Its next to the fuse box. On the top of the box facing the top are the following words; Gel (and) Ness Immediately under these two words are 6h (and) 2h. There seems to be a gap in the outer casing of the box through which there 'seems' to be a wheel that has knurled edges as if it is tempting me to insert a small screwdriver and turn it! So far I have resisted the temptation to meddle. Can anyone tell me what that's all about?