Switch charge from main to leisure battery

[BigYellowCampers]

Hi all,

Hope you can help...

When the van is running the main battery is charged, when that is full, there is a devise/switch that automatically switches the charge from the main battery to the leisure battery....On my van this switch doesn't work, so I need to get another, however, I have no idea what such a thing is called....any ideas?

Thanks for any help folks

[MidLifeCrisis]

It's called a split charge relay.
In its simplest form it is just a relay that connects the positive terminal of the starter battery to the positive battery of the leisure battery - with the relay being triggered when the engine is started (usually using the alternator signal wire)
Lots of info in the Wiki at the link below;
https://club8090.co.uk/wiki/Ca ... it_charger