yup , my dc socket only works when the ign is on , doesn't work on acc , and im not allowed to modify the car
Find the fuse box, add one of those piggy back fuses to a fuse that is live all the time, and has a suitably sized fuse, so you know wiring can take it.
Then add a trailing cigar socket to that. Earth on nearest metal part...
You could remove the accessory socket fuse, then use a piggy back fuse, to feed the accessory socket either using an old blown fuse for the contact, or a male 1/4" faston connector.
Then when you return the car, no evidence, no cut cables... sorted
:thumb2
Take pics before and after, so you know what you did.:thumb2
Running a car on tick over for long periods is not good, especially if you have a DPF, Diesel particulate filter... :doh
The DPF will get blocked, due to low temperatures in the exhaust, then the engine will attempt to burn off the soot by injecting more fuel, or in the case of Citroen, more eloys fluid.
At some point, the filter will be blocked, and can no longer be regenerated, this will not be covered under warranty, and probably not on your scheme either.
The DPF is a very expensive item to replace.
Rustic