On Wed, Oct 28, 2009 at 7:43 PM, Timmy Evens <monkey_lips@yahoo.com> wrote:
> i'm installing a DC 0400 Norcold fridge in my 83 westy. the manufacturer recommends not having any appliances wired between the auxiliary battery and the fridge as to avoid some fluctuation electrical phenomenon that i don't understand. i have a large gauge wire coming off an isolator in the engine compartment coming to an auxiliary battery under the front seat. i have an inverter wired off of the aux battery and was thinking of placing another larger deep cycle battery under the bench seat to boost total amp hours out of my auxiliary system. can anyone think of a reason why this wouldn't work?

This fluctuarion is probaly disturbances caused by high reactive load
by the engine in fridge and same thing that someoldtimes made
disturbances on television when fridge started. Very bad for digital
appliances. Battery can filter some of these and good one probably
resists them better.

Assuming You are connecting this exta auxiliary battery in parallel to
the first auxiliary one (+ to + and - to -). Maybe check the max amp
rating of Your isolator and also keep in mind that if You have 3
batteries in Your van it is quite a load for Your alternator. Be
careful with the wiring thou, max currents from those batteries will
fry any wire (and the van) faster than ... . well.. faster than
something alot faster than Your van. I would also avoid connecting
other appliances to the same wire with the fridge and install a couple
of noise filters anyway on wires that have sensitive devices.