Swapping out split charger for dc to dc charger

[Dee T6]

Is this straightforward enough to give it a go myself or get an auto electrician to do the work?

Looking to replace split charger system with Victron dc to dc charger.

 

[BiTurbo]

You should replace the battery too, as that split relay just lets the alternator throw all the current to the aux battery and the aux battery can’t cope and dies. Whoever fitted that has no idea T6’s up have smart charging alternators.