Originally Posted by loryray
I have this problem of draw down w/nothing on. batts only last about a day.Class a 373ds. Run gen for a couple of hrs. Shows a charge on my meter. and onl get a 2/3 full charge shown on control panel. Same w/engine alt. Dealer says a .02 amp draw while sitting is normal????? does any one know for sure what the problem could be. Have un plugged every 12v fuse one at a time and foun nothing irregular.
.02 amp is nothing to worry about.
I bet you have more than that.
Get a decent meter.
Put it on amps scale.
It needs to be 2 amps or more-- not milli amps scale!
Turn off everything in your RV.
Pull out a fuse and place the meter leads across the fuse holder.
The meter will read the amps or fractions of amps in that circuit.
Take note of what the meter says and what the fuse is for.
Check each fuse one at a time. Write down what you find.
This will tell the tale-- assuming all the fuses are located in the fuse box.
Some things are taken right off the batteries with inline fuses and don't
go thru the fuse box.
Those have to be found and tested also.
Do NOT put the meter in a fuse holder and turn on something like
your power awning or power steps. It will blow the meter internal fuse
and possibly smoke the meter.
This test is for parasitic loads and that means motors and such are OFF
during the test.
Once you have done this you will know what's siphoning the power out
of your batteries.
As mentioned below it could be a bad battery.
Also as mentioned the little LED battery charge indicators that come with
RVs are notoriously inaccurate.
Measure battery charge with a meter.
12v on a battery with not much of anything turned on means the battery
is approx half dead.
12.6v means it's nearly full.
Notice that the difference is only a few tenths of a volt.
That's why you need a decent digital meter to tell what's going on.
IF you check all fuses and the total current found is less than 1 amp total-
go to the battery and disconnect the battery lead.
Put the meter across the battery post and the lead you removed.
Read that for total amps WITH EVERYTHING OFF.
If you find a much higher reading at the battery than all the others put together
it means there is something somewhere that's hooked into the battery circuit
that you haven't found yet.