This seems very unlikely.  The most probable reason that I can think of is
that the chassis of the fridge is in contact with the body of the van and
that is providing a partial ground path for the negative side of the supply
circuit.  Give us as much detail of the measurement method that you can.
 Maybe you can try carefully isolating the whole thing from ground and
repeating the measurements.

Larry A.

On Sat, Aug 16, 2014 at 10:01 PM, Richard A Jones <Jones@colorado.edu>
wrote:

> I've been trouble shooting a problem with my fridge--
> a Vitrifrigo, installed in '09, or maybe '08.
>
> I suspected the ground for my aux battery setup--under
> the L-F fender.  It turned out to be that.  I used a
> wire brush on my drill to clean down to shiny metal and
> then screwed down the (copper) ground post and everything
> is copacetic.
>
> Let me mention that in tracking down my problem, which
> could have been a failing fridge or other things, I
> used a DC clamp-on amp meter.  Google Craftsman 82369.
> It is the only meter that will measure DC amps that I
> found, in the mid-price range.  ($54)  It was REALLY
> helpful.
>
> Anyway, here's my question for the electron jockeys:
> I measure higher amps going INTO my fridge (+) than
> coming OUT (-).  I'm thinking that the fridge is using
> power (and putting out heat, noise, etc) and so that
> is OK.  But....
>
> Can someone explain what is going on, what should be
> going on, etc?  Thanks!
>
> Richard
>