Hi, I have a problem with my 1991 Talbot Avalon, the second battery does not seem to be charging. It is flat, only showing 10v, with the vehicle running the voltage does not increase. Does it charge from the vehicles alternator directly or via the Zig CF8 unit? If it comes through the Zig unit does anybody know if there is a seperate fuse I can check for this circuit? I have checked the 3 on the front of the unit and they are ok. Any other help would be gratefully appreciated. Thanks, Neil.