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Old 10-12-2017, 09:31 PM   #1
Join Date: Jan 2017
Posts: 53

I bought a 2011 mountain air an the battery's go dn over nite what would do that the coach battery's and the chassis also,I don't no much about it , the light switchs stay lite all the time throughout coach how do I cut them off

Ken. Tudor
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Old 10-12-2017, 10:01 PM   #2
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Tranquil Jim's Avatar
Newmar Owners Club
Spartan Chassis
Join Date: Aug 2015
Location: Northwest Washington State or Western Montana, depending on the season.
Posts: 3,287
How old are the batteries? Are they the original 2011 batteries? My first guess is that the batteries are at the end of their life cycle.

I don't understand what you mean by "the lite switches stay lite all the time." Are the switches, themselves, backlighted for visibility at night? Or, do you mean that they don't turn the lights off when they should?


Jim (W7DHC), Diane & Mini Schnauzers, Lizzy & Ellie
2018 Mountain Aire 4047 + 2014 Honda CR-V "toad" w/AF1
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Old 10-13-2017, 05:16 AM   #3
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Consider this?

Rick and Lynn
2003 Newmar Kountry Star DP 3904
The Villages, FL
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Old 10-13-2017, 05:33 AM   #4
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Ken, even new batteries can be ruined quickly if they are discharged down too much, too often OR if the charging circuit is not set properly for the battery type, charge rate, etc... if both your chassis and house batteries are going down, could be the charger is not working as well...

Some get into rv's and think it's just like your house, use everything LIKE at the house and you can't... some high draw things will bring batteries down in an hour...

I already replaced the batteries in our new to us 2011 coach - pretty sure the previous owner didn't take great care with the batteries.

Good luck, and this 'lectricity thang can be a rabbit hole that will keep you reading for a while
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk, 11 MVP Destiny, Open Range TT, popups, vans, tents...
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Old 10-13-2017, 05:47 AM   #5
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Location: Wellington, Florida
Posts: 13,562
Hi Ken1960,
1. Fully charge the batteries.
2. Take them or have them stress tested. Any automotive parts store can do this. Or you can buy a stress tester.
3. The batteries may show the voltage of being fully charged. However if they are worn out there will not be much power (AMPS) in the batteries.
4. If this is the case they will need to be replaced.

If the batteries check okay, there may be something wrong with the coach:
1. Is the coach connected to shore power? If yes, the batteries should not loose power.
2. The BIM or BIRD (don't know which you have) needs to be looked at.
3. Have the converter checked out.
4. Have the circuit from the converter to the BIM/BIRD and then to the batteries checked out.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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Old 10-13-2017, 03:49 PM   #6
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Welcome to the forum and irv2, Ken.
This link will lead you to all TSB;s ,brochure, owners guide and othe info for your coach.
This link will explain your BIRD System for all your batteries.
All the links below in my signature have more info for your Newmar.
As Gary said you need to charge your house batteries, check the water levels if wet cells, charge for over 24 hours with a good stand alone battery charger.
Dealers do not continually charge batteries while coach is on their lot, yet they keep using them to extend your slides and low batteries will get slides in trouble always use GEN or shore line.
If the batteries come back to life and you have at least 110 at home plug your shore line in and you BIRD System will keep all your batteries fully charged.
As Gary said you need to test them with no external power and just read across the batteries need 13.5 or close.
With the BIRD System working and your converter supplied the 110, charging voltages will be between 13.5 and 14.5 volts.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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