Hi can anyone assist, I've recently purchased a T6 with camper king conversion the power management system control is a CBE PC100, my query is when I check my leisure battery the bottom one of the 4 green vertical lights doesn't come on, then I check my vehicle battery only the two middle light of the four come on, both batteries are fully charged, the gent I bought it from informed me this is normal but is just seems weird that there are a bank of 4 lights and the bottom one doesn't come on, any help advice on this would be appreciated.