Originally Posted by
Bidja
Trust you got at least 6mm2 wire/conductors and inline fuses. Engel sockets hook up wire are fused (10 amp fore both +ve & -ve wires).
As mentioned it is worthwhile to go to battery shop and get your battery load tested and they should also check your alternator output (all loads on & off). It is in their best interest as they want to sell batteries (now or later).
This is good. But, IMO and if time allows I would still go and get your battery and alternator check out now (get a performance baseline as reference), then stick it on the charger and see how all holds up. Your call.
When you run your dedicated +ve and -ve wires for the fridge don't use a cigarette / aux socket, get a proper Engel plug and socket (a screw in solid connection). Will avoid a poor electrical connection, the fridge being disconnected resulting vibration or being accidentally pulled out.