Seem to have a problem with this circuit. Car does not get used much, garaged. Its kept on a charger, loads of cranking power when trying to start, but I noticed all the devices I have connected to the switched live dont work, then with me doing literally nothing but leaving the car for a few mins the switched live comes to life...! Been like it for a few years now, runs perfect after that, just when left for a while, anything over a week which in reality is probably a month or so between uses, less in the winter.
Any ideas?!