Hey Moto,
I'm guessing you have a 12 pin plug on your car and expanda, do you have power going through pin 2 and 8 for the fridge and battery. I have a 12 pin already with battery voltage at pin 8 but nothing at pin 2, interested to know what set up you and others have.
Cheers Tony
Hi Tony
Trailer wiring always seems to be a hot topic, I did a bit of research when we were getting our panda so see if any of this information is of help to you.
If your vehicle is a fairly recent model and has a factory fitted tow bar or your trailer wiring is connected into a loom connector provided by the manufacturer then pin 2 will now most likely be hooked to the reverse light circuit. Pin 2 has always been designated as reverse lights in the ADR but untill the 12pin plugs became available and with reverse lights rarely used on trailers pin 2 became the defacto standard for aux wiring. Over time the power requirements for vans has increased so it became clear that the small connectors on the 7pin plug were not up to the job. Many people now use Anderson plugs for the power connector and of course the 12pin plugs have the 5 heavier pins for this purpose. Have a look at the ADR for trailers here
http://www.alltrailerspares.com.au/Assets/Documents/AUSTRALIAN DESIGN RULES.pdf The electrical info starts on page 24 and you will see that pin 8 is to be used for "battery charger" and pin 9 for "auxiliaries" pin 10 is also used for another earth.
So if you were to wire your 12pin to ADR standards you will have
reverse on pin2
+12v on pin 8 to charge your van battery
+12v on pin 9 to power your fridge
To complicate things jayco only half follow the ADR, if you have a read of this thread
http://www.expandasdownunder.com/showthread.php/225-Trailer-Plug?highlight=trailer+plug
you will find a page from the Jayco owners manual that shows Jayco still use pin2 for battery charging and pin9 for the fridge.
So there you are the water seems a bit muddy at the moment, in my case ford have wired my 12pin plug to ADR standards so I have changed the wiring on my expanda to suit (moved the wire that was on 2 over to 8)
at the risk of going on a bit you may also like to have a look at this thread
http://www.expandasdownunder.com/showthread.php/178-Check-your-Anderson-Plug-wiring?highlight=setec
Where in one of his posts expanda brought attention to a shortcoming in the way the setec units handle a battery once it goes bellow 10v. I am currently in contact with setec technical to try and get a workaround that will not void my warranty, the way it works now is of no use if you don't have access to 240v.