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11-23-2020, 05:05 AM
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#1
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Junior Member
Tiffin Owners Club
Join Date: Apr 2020
Posts: 23
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Flashing "Low Voltage" warning
2019 Phaeton 40IH
Getting ready to head home from weekend RV trip when I started the engine and a dash indicator began flashing "low voltage" ( in large, greenish blue letters) There was also a small indicator glowing red that said "check system".
While trying to find some information in the large binder book, I decided to turn the engine off and let it set...found Nothing in the big manual binder saying anything about dash warning indicator lights, or trouble shooting.....
After 5 minutes I restarted the engine and wa-la, the flashing low voltage warning had disappeared....
Any ideas what might have caused this warning, and/or why turning off the engine for several minutes the warning went away????
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11-23-2020, 06:30 AM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,425
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How long did you let it run with the warning ?
The low voltage warning may have been the intake air heaters. They draw over 100 amps and after starting the engine they can run for a while. Once they go off or you raise the idle, the charging system can handle the load. At idle, the alternator can't.
Likely a normal thing in cooler weather.
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11-23-2020, 06:31 AM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: jackson,nj
Posts: 172
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normal , the heating grid in the air box draws alot of power, after the engine starts and the alternator starts charging it will go out.
__________________
allen and bonnie
2019 37bh
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11-23-2020, 06:39 AM
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#4
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Senior Member
Join Date: Oct 2014
Posts: 7,881
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Quote:
Originally Posted by alv3769
normal , the heating grid in the air box draws alot of power, after the engine starts and the alternator starts charging it will go out.
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VERY likely the correct answer.
Once oil pressure has built, use the cruise to raise idle speed to around 1,100. Alternator will be putting out more amps and intake manifold heater grid will be requires for less time.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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11-23-2020, 08:42 AM
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#5
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Apr 2012
Location: Southern NM
Posts: 3,374
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Quote:
Originally Posted by alv3769
normal , the heating grid in the air box draws alot of power, after the engine starts and the alternator starts charging it will go out.
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Agree...
__________________
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2022 Jeep JLURD
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11-24-2020, 05:11 AM
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#6
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Junior Member
Tiffin Owners Club
Join Date: Apr 2020
Posts: 23
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Thanks everyone for your quick replies regarding my "low voltage" indicator. I've combed every page and every book provided by Tiffin when we purchased the new Phaeton 40IH last September, but there's nothing regarding the engine/chassis functions or trouble shooting. Tiffin provided books on the Allison transmission, but that's it. If something goes haywire with the engine, there's nothing to refer to.....
Your responses are very much appreciated and right on point. This is a great owners forum for those of us just entering the diesel pusher phase of our lifetime RV'ing experiences.
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12-07-2020, 08:23 AM
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#7
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Member
Newmar Owners Club
Join Date: Dec 2019
Location: Baton Rouge, LA & Gulf Shores, AL
Posts: 98
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I have the same problem. Had it checked at dealer and Tiffin. They said it was not an issue. If you check at batteries, they will check out good.
My model did not come with a supplemental battery buddy charger. I had one added installed. Still get the low charge warning during starts after the RV has been sitting a while, but goes away in ~10 seconds. No alarm if I re-start RV after running it before.
__________________
2022 Tiffin Phaeton 36SH & 2023 JLU392
2021 Newmar 4369, 2017 Tiffin Red, 2005 HR Neptune
2017 JKUHR, 2014 Grand Cherokee, 2009 JK
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12-07-2020, 08:36 AM
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#8
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Its normal and expected behavior to sometimes get a low chassis battery warning upon starting the propulsion engine. There is a intake air heater that kicks in when starting the engine (takes the place of glow plugs). It pulls a lot of current and sags the chassis batteries. Soonest the engine starts the engine alternator charging recovers the batteries. As the batteries age you may see it more often.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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12-07-2020, 09:57 PM
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#9
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,526
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My 2017 40IH has done that since new. It's perfectly normal.
__________________
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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01-29-2021, 08:51 AM
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#10
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Junior Member
Join Date: Dec 2020
Posts: 15
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I spoke to the Tiffin chassis folks last week when I too saw this, and they confirmed the same. Normal. Heaters in the engine intake draw a heavy load which may show up as low voltage while they are on. The warning should disappear when the engine warms a bit and the heaters shut off.
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01-29-2021, 10:25 AM
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#11
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Senior Member
Join Date: Sep 2015
Posts: 463
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Quote:
Originally Posted by lyonstom
Thanks everyone for your quick replies regarding my "low voltage" indicator. I've combed every page and every book provided by Tiffin when we purchased the new Phaeton 40IH last September, but there's nothing regarding the engine/chassis functions or trouble shooting. Tiffin provided books on the Allison transmission, but that's it. If something goes haywire with the engine, there's nothing to refer to.....
Your responses are very much appreciated and right on point. This is a great owners forum for those of us just entering the diesel pusher phase of our lifetime RV'ing experiences.
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You can download the chassis manual from Tiffin's website. It mentions the air heater but no details are provided. You received far better answers from others here.
Sam
__________________
2021 Tiffin Phaeton 40IH
2016 Jeep Wrangler JK Sport TOAD - Air Force One
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01-29-2021, 10:35 AM
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#12
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Senior Member
Tiffin Owners Club
Join Date: Mar 2012
Location: Portland, Oregon
Posts: 634
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Quote:
Originally Posted by JDSwett
I spoke to the Tiffin chassis folks last week when I too saw this, and they confirmed the same. Normal. Heaters in the engine intake draw a heavy load which may show up as low voltage while they are on. The warning should disappear when the engine warms a bit and the heaters shut off.
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I had an Aqua Hot factory rep tell me anytime the temp is below 50F to run the Aqua Hot engine pre-heater for at least 30 minutes. When I did this the engine pre-heaters did not come on therefore NO low voltage lights! Seems to work well. Aqua Hot does a great job with the engine pre-heater.
__________________
Jeff & Gail
2019 Allegro Bus 40AP
2018 GMC Canyon Denali
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01-30-2021, 07:01 AM
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#13
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Senior Member
Join Date: Feb 2020
Location: NY State
Posts: 3,089
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This only happens often in cool to cold weather. When it's warm, the preheaters aren't needed and don't run. Like many others, I was surprised and concerned the first time. When I use the engine preheat function on the AquaHot, it happens less often. I let the engine idle for a minute or two before turning on the fast idle with the cruise control, but that's probably just me being fussy vs. simply waiting for oil pressure and doing it sooner.
__________________
John
1976 Southwind 28', '96 Winnie 34WK,
2006 Tiffin Allegro Bus 40QDP
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