I have just plugged in my mains cable to a CI motorhome and do not see power reaching the leisure battery to recharge it. The mains otherwise is working in the van. I have located the unit a Nordelettronica MD TE43. I have checked all the fuses I can see but see no reset button on the unit which is awkwardly located under a front seat in a Mercedes cab. How should I proceed? Can I test that the unit is still working - there are no abvious lights on it when I connect. Or is it dead?