More modern cars like the l322 have a switched live for the ciggy lighter so not much good :(
My lighter sockets are permanently live. As is the little socket in the boot. Do you know if there Is there a solar powered trickle charger that doesn't need a mains charge? Oh and if so would it feed the battery via cigarette lighter. Some sort of one way system blocking the panel from drawing power from the car?
 
Get a solar panel that has a regulated output, something north of 12.6VDC, you don't need to worry about the panel drawing power from the car as they are not capable of that.
The one I have is very similar to this. Amazon product
 
Most of the cigarette lighter socket are wired into the battery via a fuse so they are permanently live. So yes, plug the 12volts from the charger into there. The other end goes into the mains. (just in case you really are thick as you make the claim to be :) )
The cig lighters on all my cars only operate with the ignition on so no use for solar charging.
 
My lighter sockets are permanently live. As is the little socket in the boot. Do you know if there Is there a solar powered trickle charger that doesn't need a mains charge? Oh and if so would it feed the battery via cigarette lighter. Some sort of one way system blocking the panel from drawing power from the car?
A 20 watt solar panel and a charge controller is what you need, or maybe being so far north a 50 watt panel. I plug in via the trailer socket which is easier than an internal socket. There is no drain from the car to the panel. I have solar chargers for all my vehicles, they will not charge a flat battery but do keep the batteries nicely topped up. Panels and controllers are available for very little on AliExpess.
Edit, looking at the daylight hours in winter in Scotland, I think a 100 watt panel is needed to be effective all year round.
 
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Get a solar panel that has a regulated output, something north of 12.6VDC, you don't need to worry about the panel drawing power from the car as they are not capable of that.
The one I have is very similar to this. Amazon product

Very expensive and it does not seem to have a proper charge controller to prevent over charging in summer?
 
Otto's lighter socket is definitely switched - '97 P38.
I linked in to the permanent live for the release in the lower tailgate and put an earth to a bolt back there for my trickle connection.
 
Otto's lighter socket is definitely switched - '97 P38.
I linked in to the permanent live for the release in the lower tailgate and put an earth to a bolt back there for my trickle connection.
It's better to use the permanent live located behind the P38 left side trim panel for the trailer hook up, it's a proper fused supply and easily accessible. There is also a ground wire there too.
 

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