All sounds normal to me and is the same as our 13 pin westfalia electrics.
As long as when your ignition is off there is no 12v feed there surely is no problem.

If my 'playing' with the 12 volt secondary charging and fridge circuit circuit from the tow car is anything to go by, then it is independent of the ignition circuit - (which would need to be fairly hefty to cope with the high amperage involved ! ) as such, I believe that the only switching is done via the voltage output relay. It could be that there is a slight delay after stopping the engine/alternator before the battery output falls lower than the switching threshold ? Perhaps a longer wait after stopping the engine may prove if the switching is working correctly ?

To conform with ISO 11446 Pins 3, 9, 10, 11 and 13 should be 2.5mm cable. All the rest are 1.5mm. As Pin 10 is the positive for the fridge, then 2.5mm cable is more than adequate for the job.

Ahhh! My kind of response to a "so called" problem. If it aint broke......






But....
I still want to know how things work and why, sometimes, they don't work.

It would seem to me that you have enough information on everything to leave well enough alone on this particular point :)

Zitat

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ie ignition but not engine on and fridge runs.

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This is not correct if it was you could run the car battery down in no time at all just by having the ignition to the on position .......... if it is correct then i'm pleased mine is not wired that way (2015 car aftermarket fitting)

Quote: hob wrote in post #24

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Zitat

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ie ignition but not engine on and fridge runs.

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This is not correct if it was you could run the car battery down in no time at all just by having the ignition to the on position .......... if it is correct then i'm pleased mine is not wired that way (2015 car aftermarket fitting)

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In part I'd agree with this. There appears to be a lot of confusion regarding the wiring of vehicle electrics especially as concerns the fridge. I had an awful lot of trouble with VW regarding the 13-Pin wiring on my Touran so do feel at least somewhat qualified in giving my opinion here.

In almost all cases, the fridge lighting will run when the vehicle is hooked up to the caravan and this is because the lighting is connected up to Pin 9 which is a constant supply. The fridge light illuminating is not an indication that the fridge itself is running of course and because it runs silently and takes some time before a cooling effect is noticed, the most reliable way of ascertaining whether it's actually running or not is by placing ones hand on the external grill.

As to the question of whether or not a correctly wired fridge (Pins 10 and 11) runs i.e. cools, with simply the ignition turned on or whether a certain number of engine revolutions need to be achieved is another matter altogether and I'm guessing that in part the answer to this depends on the type and characteristics of the relay used.