Join Date: Jul 2010
Location: West Malling, Kent
Thanked 52 Times in 36 Posts
We have the big red switch.
The way it was described to us by the bloke at Choose Leisure, Canterbury, who did the handover was that after you turn the isolator to the off position, you still have to force the 'van to drop the connection to the Engine battery.
He did this by flicking a few lights on and off until you heard a relay go 'klunk'.
I must admit I played with it a few times when we first got the 'van and managed to drain the leisure battery and engine battery, AND blow a 50A fuse.
I was prompted to mess around with it because it seemed I couldn't leave the van parked on the drive for more than a couple of weeks without the batteries going flat (probably due to residual current drain from the alarm etc).
I must admit I found the whole procedure just plain confusing, so I now leave it ON all the time, and leave the van plugged into the mains at home. I've been doing this for 3 years now, with no ill effects.
The circuit diagram below is for the Internal wiring for the Calira EVS 30/20 Charger in our Sun Ti 650 MF. According to this, the big red switch cuts the negative connection from the leisure battery, though the Engine battery will still power everything until the Calira charger decides to drop the connection to terminals 26 & 27 which is triggered by the process I tried to describe above.