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Old 11-23-2020, 06:05 AM   #1
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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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Old 11-23-2020, 07:30 AM   #2
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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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Old 11-23-2020, 07:31 AM   #3
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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.
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Old 11-23-2020, 07:39 AM   #4
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Quote:
Originally Posted by alv3769 View Post
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.

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.
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Old 11-23-2020, 09:42 AM   #5
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Quote:
Originally Posted by alv3769 View Post
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.
Agree...
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Old 11-24-2020, 06:11 AM   #6
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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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Old 12-07-2020, 09:23 AM   #7
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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.
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Old 12-07-2020, 09:36 AM   #8
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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.
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Old 12-07-2020, 10:57 PM   #9
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My 2017 40IH has done that since new. It's perfectly normal.
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