New to me 99 Patriot Thunder. All batteries going dead.

[Melski]

All my chassis and house batteries are good. The problem is, when I let sit for 3 days all batteries go pretty much dead. Both chassis and house. Salesman switch off, nothing left on. Any ideas? Islolator?, Boost switch? Any help greatly appreciated.

[CountryB]

There are systems that will drain the batteries even with the Coach Power switch off.

You have to use the "battery disconnect switches" located (usually) in the battery compartment to stop the drain if you don't have a way to keep coach charged/plugged-in when in storage.

[Chargerman]

Even with the battery switches turned off you may still have parisitic drains that will kill the batteries. Best to keep it plugged in when sitting for any period of time or disconnect the battery cables to be sure if no electrical source is available

[Melski]

I didnt notice any disconnect switches in my 99 beaver patriot. Think it would be ok to just install good old fashion disconnects at negative terminals of chassis and house bats? I thought the isolator prevented draining of all batteries. I guess there could be a 1000 things causing parasitic drain on these things.

[clyon51]

I have to ditto CountryB.

[Papa_Jim]

I learned that the best procedure is if the coach is not running, then it is plugged in. Then the batteries are constantly kept in a state of full charge.

Jim

[RamiDav]

Three days , that's pretty quick to run down especially both sets .
My first thoughts are if you are sure the batteries are getting fully charged ?
Tell us about their charging before setting for 3 days .

Ray

[Melski]

Yes all fully charged.

[clyon51]

Originally Posted by Melski

I didnt notice any disconnect switches in my 99 beaver patriot. Think it would be ok to just install good old fashion disconnects at negative terminals of chassis and house bats? I thought the isolator prevented draining of all batteries. I guess there could be a 1000 things causing parasitic drain on these things.

The “salesman” switch only turns off 12v lighting and control systems for A/C, furnace, fridge, etc. it does not turn off safety systems like CO2, propane and smoke. It doesn’t disconnect the chassis batts in anyway either. Not sure about your coach, but most of that quality will have the “good old fashion disconnects” located near the batts. If you become sure they don’t exist, then yes, install them.

[twinboat]

Good batteries should last longer then 3 days.

In not sure how you decided that they are good, but I would disconnect all of the negative battery terminals for 3 days and see if they still go dead.

If they do, you need batteries !

[RamiDav]

Originally Posted by Melski

Yes all fully charged.

How do you know they are fully charged and how did you fully charge
them ?

Not trying to needle you or any thing but you would not be the first
with such problems that found their batteries were getting charged
but not near fully .
It takes a lot longer to charge those batteries than we want to imagine
If the batteries are low I'm not sure you would drive long enough to
get them all charged .
The alternator normally will not start charging the house batteries until
the start batteries are charged .

Going to a battery place like Interstate ( they have stores ) and let them
check the charge and then load test them would tell you a lot .
I have found Interstate to be very helpful but other places could do the
same thing .

Ray

[Melski]

Chassis bats new, house all checked by interstate as good. Seems to me either the isolator or the boost switch are bad. Those are the only 2 things that connect the to banks together. The isolator is supposed to protect all bats going dead or keep them separate. Im thinking if isolator or boost switch is bad one or the other is allowing both systems to be energizing circuits that should not be energized when working properly. Or maybe one of the 100 solenoids stuck open.

[RamiDav]

Originally Posted by Melski

Chassis bats new, house all checked by interstate as good. Seems to me either the isolator or the boost switch are bad. Those are the only 2 things that connect the to banks together. The isolator is supposed to protect all bats going dead or keep them separate. Im thinking if isolator or boost switch is bad one or the other is allowing both systems to be energizing circuits that should not be energized when working properly. Or maybe one of the 100 solenoids stuck open.

Do you know what system of isolating and charge sharing your coach has ?

Can you hear the boost solenoid when someone operates the switch ?
Mine is in the rear elect panel .

If you can identify that solenoid and it is hot then you may be correct .
If it stays activated all the time it might create enough drain

[96 Wideglide]

Originally Posted by twinboat

Good batteries should last longer then 3 days.

In not sure how you decided that they are good, but I would disconnect all of the negative battery terminals for 3 days and see if they still go dead.

If they do, you need batteries !

There's a good idea!

I recently left my coach unplugged for 3 or 4 days, and house batteries were only down to 12.5V.