A few weeks ago after the cold snap we've had recently I thought I would check the state of the battery on the V. It was very low so I stuck it on the old Optimate. Checked after a couple of days it was reading 12.5+volts so all good.
Just been out this morning find the battery to be below 5 volts.
So I am wondering if, having left the Optimate connected to the battery although not connected to the mains it could 'leak to earth'?
Maybe my additional wiring for the twin horns via solenoid or the Tomtom wiring which are both connected directly to the battery (with inline fuses)
I'm going down the leaking Optimate route at the moment and it's charging the battery up again as I type, disconnect properly then monitor the battery state over the next few days.
I hate the dark art of electrics, can anyone shed any light?