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Thread: Battery balance light

  1. #1
    Join Date
    May 2019
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    Leesburg
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    550

    Default Battery balance light

    Driving I-95 yesterday, battery balance light started flashing then stayed on full time. Pulled in next rest stop. Checked all connections, all were tight and no signs of heat. Checked both Vannor's (chassis & house), chassis one was OK, house green led on Vannor was not lit and voltage reading were 27.1 & 14.3. Started generator, balance light went out, but Vannor still had same readings as noted.

    Recently had all the house bank of batteries out to replace a R-14 relay valve. Check all the 4 year old batteries at that time, all but one checked OK. The one that was weak was still good but not as good as the others.
    Do I have a bad Vannor or maybe that one battery is giving up. On the road an no time for in depth diagnosis right now. Not sure why running the generator makes the balance light go out but the voltage is still not within proper parameters.


    Chuck & Katrina
    2000 Featherlite
    H3-45 Double slide
    2014 Jeep Grand Cherokee Diesel

  2. #2
    Join Date
    Apr 2019
    Location
    Arlington
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    831

    Default

    Chuck:


    Are we talking about the balance light on the dash? I always assumed that this would monitor the chassis batteries only. I would think that the house battery Vanner would have its own monitoring system. If it is the dash light, and the chassis vanner has a green light, then it might be the monitor that is bad. I have read that these fail more than the Vanner itself.

    To check the Vanner you need to have the green light on. If it is not on and it is working properly, turn on some larger 12 volt loads and the green light should illuminate. With the green light on, check the voltage between the 12V and GND terminals. Then check it between the 12V and 24V terminals. The 12V/24V measurement should be equal to or not greater than +0.1V compared to the 12V/GND measurement. As an example, if the 12V/GND reading was 13 volts, the 12V/24V reading should be between 13 and 13.1 volts.

    So, let us know what balance light was on and how the above test works.

    BTW, with the readings you provided, I assume that the engine was running? I would do the test without it running.


    Mark and Debbie Fratto
    1998 Parliament

  3. #3
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    Default

    Hi Mark:
    Have done the test with the Eng running and off, Same results. Featherlite said they do tie the house Vanner into the dash light too.
    Called Vanners custom coach and bus division, they said most likely a bad ground or one of the batteries in the bank is going out. Have arranged to borrow a AGM battery tester tomorrow. Will update once I know more.
    Chuck
    P.S. Hope it is a battery, that’s cheaper than a Vanner LOL
    Also green LED on Vanner has never come on.
    Last edited by Ck2hans; 05-09-2024 at 03:51 PM.
    Chuck & Katrina
    2000 Featherlite
    H3-45 Double slide
    2014 Jeep Grand Cherokee Diesel

  4. #4
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    Arlington
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    Default

    Good to know. Let me know how the batteries check out.


    Mark and Debbie Fratto
    1998 Parliament

  5. #5
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    Checked the house batteries with a tester this afternoon. One of the 8 houses batteries was in bad shape (9.4Vdc), the rest tested in great shape. Replaced it and will check the system tomorrow after the batteries have a chance to equalize tonight.

    Chuck
    Chuck & Katrina
    2000 Featherlite
    H3-45 Double slide
    2014 Jeep Grand Cherokee Diesel

  6. #6
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    May 2019
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    Leesburg
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    Everything is back to normal this morning. Vanner voltages are back to within.01 volts difference.
    Phew, dodged a $1k bill on a new Vanner.

    Chuck
    Chuck & Katrina
    2000 Featherlite
    H3-45 Double slide
    2014 Jeep Grand Cherokee Diesel

  7. #7
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    Arlington
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    That is great news. Now you can have an awesome weekend.


    Mark and Debbie Fratto
    1998 Parliament

  8. #8
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    I wonder how many converters tie the dash balance light to both the chassis and house battery systems?


    Mark and Debbie Fratto
    1998 Parliament

  9. #9
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    Don’t know, but it was quite helpful in my situation
    Chuck & Katrina
    2000 Featherlite
    H3-45 Double slide
    2014 Jeep Grand Cherokee Diesel

  10. #10
    Join Date
    Nov 2018
    Location
    PIEDMONT
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    Default

    Never gave it much thought, but now that I do - my house and chassis are both tied to both battery lights (red and yellow). It uses a high current solenoid (24v coach) rather than an isolator which connects chassis/house/alternator output together once coach (alternator) is running.

    If coach has been unplugged for awhile and I start engine and turn on shore power (or probably generator also) the inverters immediately ramp up briefly to a voltage high enough the red battery light will illuminate. Once I see that I either turn off engine or shore power. If starting and coach has been plugged in and in float mode, no battery light.

    Had never seen yellow battery balance light. Changed monitor a few months back from the old original EM70 to the later EM70D (from memory but I think that's correct) and discovered during the changeout that the ground wire was not connected on the old unit. Don't know if this was intentional or accidental. Installed new monitor and now yellow battery balance light illuminates for a few seconds after engine start and then goes out. Assuming this is normal.

    Billy & Lisa Gaines
    1996 Marathon XL40

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