I don't know, I have mine wired up for the aux battery to run the
frigde--running or not.  It allows me to stop and shop or go for a hike or
whatever and leave it on DC power for a couple hours without having to
switch between Propane and DC every time.  I don't have to worry about
running the aux battery down, it is separate from the main battery so even
if I let it run dead, the van still starts on the main battery.  That way I
also save the propane.  I'm not that cheap but it's a hassle switching back
and forth and filling it is a pain.

On Fri, 29 Jul 2005 08:24:50 -0700, mark drillock <drillock@EARTHLINK.NET>
wrote:

>In general the aux battery has nothing to do with running the 3 way
>fridge on 12 volts. These fridges only run on 12 volts while the engine
>is running. Some people modify the wiring that goes to the fridge to
>allow the fridge to run on 12 volts from the aux battery even when the
>engine is off. The battery will last several hours but not all night.
>That is why it is best not to wire it this way unless you are extremely
>careful in operating the fridge. No battery will have a long life if it
>is completely drained over and over again. The real purpose of the aux
>battery is to run lights, stereo, etc while camped without danger of not
>being able to start the engine in the morning. When you stop for the
>night the fridge should be switched over to propane since otherwise the
>cooling stops when the engine stops. If you wire the aux battery to run
>the fridge even when the engine is stopped you will be opening a large
>can of biting worms. Care must be taken.
>
>Mark
>
>dusty edwards wrote:
>
>> so, in other words, without the aux. batt., you can't use the 12V
>> function of the fridge while driving?
>>
>> sorry for the back and forth...........trying to educate myself.  i
>> didn't realize that this was the case.
>>
>> On Jul 28, 2005, at 7:32 PM, Loren Busch wrote:
>>
>>>  RE: Whats the Advantage of the aux battery....
>>> Although the aux battery will not handle the fridge for very long it
>>> allows the use of 12v on the fridge while traveling, then immediately
>>> switch to propane or shore power if available.
>>>
>>> Many people add addition 12v outlets and wire to the aux battery to
>>> run TV sets, stereo, laptops, etc.  In addition to the re wiring of
>>> the interior lights, etc. already mentioned.
>>>
>>> To find out what may have been added to the aux battery take a look at
>>> the wiring on the positive terminal.
>>>
>>  |___|_|_|__\
>>  |___|__-|-__|
>>  "(o)-----(o)--"
>>

I don't know, I like the