I’m planning to put heated seats, USB sockets, along with a diesel heater in my series - powered from a separate fuse box off the battery, which lives under the passenger seat.
There is no other wiring there - so I’m thinking if I want to stop the heated seats being left on and flattening the battery I either need to run a switched live in to a relay or perhaps fit a timed relay?
Any pro’s and cons to either or any other option I’ve not listed ?