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07-19-2017, 02:48 PM
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#1
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Senior Member
Newmar Owners Club
Join Date: Oct 2016
Location: Saline, MI
Posts: 513
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House Batteries don't Charge while Driving
Anyone ever have this happen? House batteries charge when on generator or shore power but not when driving. Is there something I can check?
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2017 Ventana 3412
Honda Fit, Blue Ox Avail, Air Force One
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07-19-2017, 02:56 PM
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#2
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Nov 2010
Location: Grapevine, TX
Posts: 1,056
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Alternator.
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Mike
2021 Coachmen Spirit 2557RB
2018 Ford F-150 3.5L Ecoboost w/Max Tow, Eaz-Lift R3 hitch
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07-19-2017, 03:09 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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Quote:
Originally Posted by Waywards
Anyone ever have this happen? House batteries charge when on generator or shore power but not when driving. Is there something I can check?
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If this has been going on quite a while and your chassis batteries are still being charged than it could be a solenoid/relay.
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1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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07-19-2017, 03:11 PM
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#4
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Senior Member
Join Date: Nov 2005
Posts: 7,383
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Not the alternator....most rigs have equipment [eg, BIRD, solenoid, echo charger, etc.] that isolate and controls battery banks for 12v charging from engine. Doesn't apply to shore power or genset which uses the inverter/charger for house bats. Need to determine if your rig is so equipped and then see if it is working.....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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07-19-2017, 03:29 PM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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Look for your isolation relay and B.I.R.D.. Could have a wire off. You should find it in the battery control center, compartment.
I doubt the solenoid is already failed on a 2017 MH.
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07-19-2017, 03:35 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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Quote:
Originally Posted by twinboat
I doubt the solenoid is already failed on a 2017 MH.
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I didn't notice it was on a new rig. I agree it's more likely a faulty connection........ or some new switch or something.
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1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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07-19-2017, 03:56 PM
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#7
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Senior Member
Join Date: Nov 2016
Location: Desert Hot Springs Ca.
Posts: 947
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I had the same problem. Was the battery isolator. Simple to check. Alternator power goes into the middle post. Coach power goes out one post. I had no power out on other post which was to house batteries. Make sure you get one if bad that is rated for your size of alternator. Mine is a 200 amp. Check this out. HEAVY DUTY Transpo Multi Dual Battery Isolator 200amp commercial truck wrecker
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Mike & Trish Romans 10:9
2011 Mobile Suites 36RSSB3
2014 F-350 6.7L CC DRW
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07-19-2017, 04:18 PM
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#8
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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Quote:
Originally Posted by MTK46
I had the same problem. Was the battery isolator. Simple to check. Alternator power goes into the middle post. Coach power goes out one post. I had no power out on other post which was to house batteries. Make sure you get one if bad that is rated for your size of alternator. Mine is a 200 amp. Check this out. HEAVY DUTY Transpo Multi Dual Battery Isolator 200amp commercial truck wrecker
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I don't think diode based isolators are used in current MHs. Your 2002 may be the last year they were used.
Now days Bi-directional Isolation Relay with Delay, ( BIRDs ) are used.
It's an electronic voltage sensing device that controls a high amp solenoid wired between the battery banks. Much more effecent and unlike diodes, has no voltage drop thru it.
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07-19-2017, 04:39 PM
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#9
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by twinboat
I don't think diode based isolators are used in current MHs. Your 2002 may be the last year they were used.
Now days Bi-directional Isolation Relay with Delay, ( BIRDs ) are used.
It's an electronic voltage sensing device that controls a high amp solenoid wired between the battery banks. Much more effecent and unlike diodes, has no voltage drop thru it.
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I agree with Twinboat. I'm fairly certain Newmar still uses the BIRD system on their coaches. Attached is the manuals for this system which should help you understand how it works.
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2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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07-19-2017, 04:48 PM
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#10
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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I don't think the majority of units have anything as sophisticated as a BIRD setup. The big buses do. I don't think the cutaway chassis are that sophisticated as Ford puts a charge relay in without the delay and checking functions in a BIRD. Not sure about the F-53.
The old diode isolators run around 0.7 V drop. The newer Schottky diode units are around 0.2 VDC. Not really worth worrying about.
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07-19-2017, 04:49 PM
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#11
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Senior Member
Join Date: Nov 2016
Location: Desert Hot Springs Ca.
Posts: 947
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Quote:
Originally Posted by twinboat
I don't think diode based isolators are used in current MHs. Your 2002 may be the last year they were used.
Now days Bi-directional Isolation Relay with Delay, ( BIRDs ) are used.
It's an electronic voltage sensing device that controls a high amp solenoid wired between the battery banks. Much more efficient and unlike diodes, has no voltage drop thru it.
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Nice to know. Not sure it's more efficient though. If that his problem it failed on a 2017. Mine lasted 15 years. Some times older is better. Well that's what my wife says
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Mike & Trish Romans 10:9
2011 Mobile Suites 36RSSB3
2014 F-350 6.7L CC DRW
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07-19-2017, 05:26 PM
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#12
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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The Class C chassis typically has a small house bank. Sometimes only one battery.
With that, the installed high output alternator can handle charging both batteries at the same time. The key actavates a charge relay. They don't need a voltage sensing relay to protect the chassis battery from discharging to the depleted house battery.
The DPs, with 400 or more AH battery banks, in a discharged state, could draw the chassis batteries down below the needed voltage to run the modern engine electronics, if the relay simply stayed closed.
The BIRD or IRD will sense the chassis battery drop in voltage and disconnect the house bank from the system and start the delay timer. During this delay, the chassis battery recovers.
It may need to do this a few times but each time the house bank bulks up a bit more. After a few cycles the voltage rises enough, or your spinning the alternator fast enough, that the chassis battery stays at 13.2 volts, while still connected to the house bank. Now your getting a high output from the alternator.
With a diode isolator, the charging is controlled, thru the alternator voltage regulator, by the chassis battery voltage only. The house batteries are isolated.
If the chassis battery voltage is up, the alternator will cut back it's amperage output. That leads to a long, slow and maybe a partial charge to the house bank.
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07-19-2017, 05:49 PM
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#13
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Senior Member
Newmar Owners Club
Join Date: Jun 2012
Location: Spicewood Texas (West of Austin)
Posts: 4,511
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Try the battery boost button and see if your voltage starts climbing. Sometimes my relay gets stuck. After pressing the button once, it seems to start working properly for a while. Probably need to change the relay eventually.
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Scotty and Kristen, Airedales Dagny and Wyatt
2007 Newmar Mountain Aire 4528, 450 HP ISM, Allison 4000, 8 Lifeline AGM's
2019 F250 King Ranch 4x4 Powerstroke - SOLD
2022 F350 DRW King Ranch 4 x 4
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07-19-2017, 08:39 PM
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#14
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Senior Member
Join Date: Mar 2014
Posts: 1,459
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House batteries won't start to charge until the coach batteries are full.
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Gary 2021 NH Majestic
Ram 5500 with Bodywerks bed
Box Elder, SD and the road
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