2011mountian air. Chassis battery's go overnight with master switch turned off I can take 60 amp fuse out at the battery box an it is ok , house battery's are ok , what could could keep a ngative pull on the battys

you will have to find out what is still hot and draining. Radio memory, alarm if you have one. Engine ECM (time to power down) Trans ECM same thing. You should be able to see what that one fuse powers. alternator diodes if bad. Did this just start ?

If the batteries are bad then any tiny bit of drain can cause them to short internally.Measure the voltage on each battery and write it down. Take pictures at the same time for future reference.Get a simple hydrometer to check them. They are easy to use. Any automotive shop has them.Check the charging voltage to see if they are getting enough. If these are original batteries and you are a new owner it is time for fresh ones, hence the pictures to make sure you do not leave one wire off.Look in storage compartment for lights left on.

As said above, if the battery is original, it's probably time for a new one. If it's a new battery, then you'll need to do some elimination to find out what's drawing so much current. Get an ammeter and put it inline with the positive lead....in between the battery and the load. Set it to read the amp draw and them start systematically unplugging fuses to see what drops the current flow significantly. It might take you a little time, but it will be well worth the effort to find a faulty component if you have one.

I doubt batteries are OK. What makes you think they are OK? Also, unless you take the time to FULLY charge them, they will not hold a charge. You need to post MORE info. There is NOTHING that will drain 2 good batteries overnight, even the headlamps being left on. 1. HOW and how long have you recharged the batteries?2. Are the batteries the original batteries?3. ONE bad battery will drain the other battery in a bank4. Regardless if you have 1 bad battery you ALWAYS replace all batteries in a bank at the same time. 5. HOW did you check/determine the batteries were good? Doug

dougrainer wrote:I doubt batteries are OK. What makes you think they are OK? Careful here.He was talking about chassis battery and house batteries in the same sentence.House OK, chassis goes dead.Either the chassis battery is dying or it is not being charged.On most units with only ONE disconnect switch, that does only the house batteries.

Short | Good Sam Community

10forty2
Explorer
Nov 05, 2017
As said above, if the battery is original, it's probably time for a new one. If it's a new battery, then you'll need to do some elimination to find out what's drawing so much current. Get an ammeter and put it inline with the positive lead....in between the battery and the load. Set it to read the amp draw and them start systematically unplugging fuses to see what drops the current flow significantly. It might take you a little time, but it will be well worth the effort to find a faulty component if you have one.
YC_1
Nomad
Nov 05, 2017
If the batteries are bad then any tiny bit of drain can cause them to short internally.

Measure the voltage on each battery and write it down. Take pictures at the same time for future reference.

Get a simple hydrometer to check them. They are easy to use. Any automotive shop has them.

Check the charging voltage to see if they are getting enough.

If these are original batteries and you are a new owner it is time for fresh ones, hence the pictures to make sure you do not leave one wire off.

Look in storage compartment for lights left on.
MountainAir05
Explorer II
Nov 05, 2017
you will have to find out what is still hot and draining. Radio memory, alarm if you have one. Engine ECM (time to power down) Trans ECM same thing. You should be able to see what that one fuse powers. alternator diodes if bad. Did this just start ?

Forum Discussion

Short

About Motorhome Group

Related Content

Short?

Short Term Winterizing?

Short Bed Silverado

Short MH's

Camper for short, short bed.