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Old 09-05-2021, 03:00 PM   #1
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Question Chassis Battery 11.7

We traveled down a very bad road and setup camp.
Coach battery & chassis battery fully on generator.
Used inverter as usual and when used a lot coach battery drops to 11.7 which is normal for us.
This time chassis battery dropped to 11.7.
Stated coach engine and coach battery went up to 13.0 and I shut off after 2 minutes.
Turned off inverter.
Now coach battery at 12.1 and never went below 12.8?

Does inverter or coach batteries use chassis batteries?

Any ideas?
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Old 09-05-2021, 03:08 PM   #2
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Started generator and both coach and chassis went to 12.6


Generator charges both?
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Old 09-05-2021, 03:53 PM   #3
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I found this on our group.
Some folks are saying generator charges both coach and chassis?

I wonder if running the inverter for tv for 3 hours brought down house batteries and then drained chassis.

Never saw inverter/house batteries ever use chassis?

Does the Generator charge House AND chassis Batteries? - iRV2 Forums

https://www.irv2.com/forums/f121/doe...es-432109.html
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Old 09-05-2021, 03:54 PM   #4
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Yes
Chassis battery & house batteries are connected for charging
- engine alternator charges chassis battery + house batteries
- generator and solar charges house batteries + chassis battery

That said, your chassis battery should not “drain” when using house batteries. You have a Solenoid in engine compartment that will keep that from happening.

Now, if yours is not functioning correctly, a faulty solenoid may be the issue
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Old 09-05-2021, 04:22 PM   #5
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Yes, your Precision Circuits BIM 160 isn't working correctly. When the coach batteries are down below about 13 volts the BIM should turn off the connection to the chassis batteries. Obviously it isn't doing that.

At least on my 2021 Axis and I suspect yours as well, there are several connections to the positive terminal on the coach battery: the converter, the generator starter, the BIM and maybe a solar panel. Find the BIM red wire and disconnect it (and wrap it with tape so it won't short somewhere) until you can get it fixed.

Otherwise you run the risk of taking down both your coach and your chassis battery and you won't be able to start the chassis engine.

David
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Old 09-05-2021, 06:08 PM   #6
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Thanks all I will either keep watching the battery level and use generator until home.

Where can I order a Precision Circuits BIM 160
Or will any rv tech have access?
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Old 09-05-2021, 06:10 PM   #7
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Old 09-05-2021, 06:13 PM   #8
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Hi where is this located on the 2020 Vegas 25.6. Maybe a wire is loose from the gravel road?
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Old 09-05-2021, 06:39 PM   #9
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Quote:
Originally Posted by LifeisGoodinVegas View Post
Hi where is this located on the 2020 Vegas 25.6. Maybe a wire is loose from the gravel road?
On V-10 in on driver’s side front
See photos below…

* That said, are you hearing the “Clunk” after you turn off ignition key (unusually abt a minute or two later)
That clunk is the solenoid
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Old 09-05-2021, 06:59 PM   #10
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No clunk sound ..I will look in that area
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Old 09-05-2021, 07:11 PM   #11
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Quote:
Originally Posted by taylorbob1 View Post
Yes
Chassis battery & house batteries are connected for charging
- engine alternator charges chassis battery + house batteries
- generator and solar charges house batteries + chassis battery

That said, your chassis battery should not “drain” when using house batteries. You have a Solenoid in engine compartment that will keep that from happening.

Now, if yours is not functioning correctly, a faulty solenoid may be the issue
Thx did not know

generator and solar charges house batteries + chassis battery
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Old 09-05-2021, 07:11 PM   #12
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BIM test???

Maybe someone on Forum can help out.
If BIM is disconnected, can a test be run to see if solenoid is properly functioning?
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Old 09-05-2021, 07:32 PM   #13
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Well, the only test I could suggest is one he has already done: Start the chassis engine and watch the coach battery voltage. If after a few minutes it doesn't come up and match the chassis engine's battery voltage then something is wrong.

But as noted above, it could be a bad connection. Check at the BIM, and at the battery terminal before replacing it.

David
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Old 09-05-2021, 09:01 PM   #14
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Kinda the same, but my chassis batteries will not charge on genny or shore. Still looking for the BIM. The trombetta works for emergency start.
Got clues on where they hide my bim? I have crawled the length more than once looking, of course I’m blind as a bat when looking for specific things. Help
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Old 09-07-2021, 02:04 PM   #15
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From Precision below. Many a wire on bim lose?

Hello George, the BIM should only connect if one battery bank is 13.3v or greater and the other bank is 12.6v or less. If neither battery bank is charging the BIM should not be connected. It’s possible both batteries can be low and the BIM is not connected.







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Downers Grove, IL 60515

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Old 09-07-2021, 07:44 PM   #16
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Quote:
Originally Posted by DavidEM View Post
Well, the only test I could suggest is one he has already done: Start the chassis engine and watch the coach battery voltage. If after a few minutes it doesn't come up and match the chassis engine's battery voltage then something is wrong.

But as noted above, it could be a bad connection. Check at the BIM, and at the battery terminal before replacing it.

David
Will check bim and battery terminal
Found this on thor site for me
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Old 09-08-2021, 03:48 PM   #17
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Now this is strange ..I got home..plugged into 30 amp and both coach & chassis read 14 4..I wonder if when inverter wired to battery and or when both house batteries changed if somehow coach battery is bring read twice by bmpro controller. I have an appt with my tech today
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Old 09-08-2021, 04:29 PM   #18
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Quote:
Originally Posted by Scubawise View Post
Now this is strange ..I got home..plugged into 30 amp and both coach & chassis read 14 4..I wonder if when inverter wired to battery and or when both house batteries changed if somehow coach battery is bring read twice by bmpro controller. I have an appt with my tech today
Or maybe the converter is charging both batteries like it is supposed to?

Maybe break out the multimeter and read the battery voltages directly if you have a question about the accuracy of the BMPRO?
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Old 09-08-2021, 09:25 PM   #19
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Kurts repair checked the issue..as stated here BIM appears bad. Kurt tested no current to coach battery when engine running & chassis being used when inverter on. I called Thor parts and said I am out of warranty and parts said mention to service as goodwill. Thor service shipping free & kurt said he would install free of charge..

Thx all
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Old 09-20-2021, 05:10 PM   #20
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Shore Power Charges Chassis Battery?

Hello everyone,
I'm new to this. I have a brand new Thor Four Winds 28Z, and here is Texas is too hot in summer, so I stored it (always stored plugged in to shore). I went to inflate tires and the chassis battery was weak when I started.
Does the shore power charges the chassis battery?
If not, then is it safe to use a battery charger and maintainer?
and if so, what type of chassis battery does it have, wet cell, gel, AGM, Lithium?

I got a NOCO Genius 5 charger and I have to choose a battery type. I couldn't find anything on the maintenance manual.
Thanks for the help!!
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