2015 R-Design T2
The start/stop on my car won't work if the car hasn't been used for a couple of days unless it gets a run of 30 or 40 miles. The main battery was replaced at the start of winter but I suspect the secondary battery needs changing too. Does anyone know if there is anywhere that remains powered by the secondary battery with the ignition off? I could then check how well it is holding a charge when the car is powered down. If I had a wiring diagram I'm sure I could find such a point, one of the fuses hopefully.