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12-23-2020, 03:24 PM
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#1
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Senior Member
Join Date: May 2016
Posts: 162
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Thor Vegas 2015 24.1 dead chassis battery
Chassis battery is new this year. MH has been plugged into shore power with 12 volt cutoff switch tuned ON and chassis battery is dead. Dash is dead.. House batteries full. Generator fires up.
Questions:
1) depressing and holding emergency start toggle does not work. Why?
2) is the engine battery supposed to get charged when plugged into shore power?
If yes, is the fact that the emergency switch doesn’t work related to the fact that shore power does not charge chassis battery?
3) when I’m plugged into shore power, turning off the 12 volt cutoff switch does NOT cut off 12 volt power in the MH. This seems like different behavior than with other MHs I’ve owned. Is this normal? Cut off switch clearly activates the solenoid as I can hear it.. it turns the 12 volts off when not plugged into shore
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-23-2020, 03:39 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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Quote:
Originally Posted by Indytraveler
Chassis battery is new this year. MH has been plugged into shore power with 12 volt cutoff switch tuned ON and chassis battery is dead. Dash is dead.. House batteries full. Generator fires up.
Questions:
1) depressing and holding emergency start toggle does not work. Why?
2) is the engine battery supposed to get charged when plugged into shore power?
If yes, is the fact that the emergency switch doesn’t work related to the fact that shore power does not charge chassis battery?
3) when I’m plugged into shore power, turning off the 12 volt cutoff switch does NOT cut off 12 volt power in the MH. This seems like different behavior than with other MHs I’ve owned. Is this normal? Cut off switch clearly activates the solenoid as I can hear it.. it turns the 12 volts off when not plugged into shore
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1) Bad isolation solenoid or BIM. My 2017 has a BIM. If you open the grill, it is on the drivers side of the radiator, mounted under the master cylinder.
2) The isolation solenoid, or BIM if equipped, handles the house to chassis charging and the chassis to house charging. It is very much related.
3) What your battery disconnect switch is doing is normal. The converter/charger is tied into the system on the house side of the disconnect solenoid. It takes the battery out of the system.
My 2017 Axis has the type in the first picture, yours may be like the second picture. 
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12-23-2020, 03:55 PM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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One other thought, did the battery cable to the isolation solenoid get left off the positive post of the new battery, while replacing the chassis battery ?
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12-23-2020, 04:13 PM
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#4
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Senior Member
Fleetwood Owners Club
Join Date: Feb 2017
Location: Texas
Posts: 836
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__________________
2000 Southwind 32v and a 03 Tracker 5 speed 2WD toad, Roadmaster off road tow bar & 2" drop hitch
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12-23-2020, 04:17 PM
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#5
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Senior Member
Join Date: May 2016
Posts: 162
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Quote:
Originally Posted by twinboat
One other thought, did the battery cable to the isolation solenoid get left off the positive post of the new battery, while replacing the chassis battery ?
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Twin boat, as usual, thanks for the great response.
I will check the battery installation to make sure the BIM/Isolation solenoid is attached.
Also, are you saying that the engine battery should in fact get charged when plugged into shore power? And the failure to do so along with the emergency switch failure can be caused by the failed BIM?
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-23-2020, 04:36 PM
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#6
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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Quote:
Originally Posted by Indytraveler
Twin boat, as usual, thanks for the great response.
I will check the battery installation to make sure the BIM/Isolation solenoid is attached.
Also, are you saying that the engine battery should in fact get charged when plugged into shore power? And the failure to do so along with the emergency switch failure can be caused by the failed BIM?
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Yes, a bad BIM will cause both things.
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12-23-2020, 04:38 PM
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#7
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Senior Member
Join Date: May 2016
Posts: 162
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Quote:
Originally Posted by Jyrocharlie
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Good stuff. Thanks!
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-23-2020, 04:52 PM
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#8
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Senior Member
Join Date: May 2016
Posts: 162
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Quote:
Originally Posted by twinboat
Yes, a bad BIM will cause both things.
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Thanks, i noticed the issue while over at the storage barn as I was taking advantage of the warm weather we had today. I’ll update the thread after I get back from investigating further..
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-24-2020, 11:17 AM
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#9
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Senior Member
Join Date: May 2016
Posts: 162
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Quote:
Originally Posted by twinboat
Yes, a bad BIM will cause both things.
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This is the diagram for my unit. Just noodling a bit until I get time to get back to the MH. Seems I have Isolation Solenoid rather than BIM.. I’m having difficulty understanding the IS connection to the chassis battery. I can see the emergency switch solenoid which is drawn as located in the step well.. That thing should have audibly clicked if working?
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-24-2020, 12:31 PM
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#10
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Senior Member
Join Date: May 2016
Posts: 162
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Also from the Thor owners website for my VIN..I can clearly see the relationship amongst the BIM, chassis, and house batteries..
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-25-2020, 11:46 AM
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#11
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Senior Member
Join Date: May 2020
Posts: 667
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Can you call Bob Tiffin? 
__________________
2007 Newmar Kountry Star 8.9 liter cummins
2019 F250 Toad
Blue OX
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12-25-2020, 01:54 PM
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#12
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Senior Member
Join Date: Jul 2014
Posts: 37,092
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What you circled is the house battery disconnect latching relay ( solenoid ).
What I circled is the aux start ( boost ) and isolation/charging solenoid. It serves double duty.
It will have voltage sensing control to close when ever there is a charging source.
That's way the BIM does.
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12-26-2020, 09:19 AM
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#13
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Senior Member
Join Date: May 2016
Posts: 162
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Thanks Twinboat. I just need to get my butt over to the MH..Might get there today as it’s getting up to a whopping 35 degrees here today.. As I read more Thor Vegas specific posts, I could have any number of battery isolation systems,,
Bird/trombetta,
Battery Control Center
BIM
Isolation Solenoid.
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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12-30-2020, 03:28 PM
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#14
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Senior Member
Join Date: May 2016
Posts: 162
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Made it back to the MH today. I definitely have a Itlellec BIRD and trombetta solenoid located on the firewall area on the drivers side.
Plugged into shore power..
Chassis Battery still dead. House batteries strong..
Emergency start button silent and inoperable. I jump started the engine successfully but probably should have done some trouble shooting first..ran engine for about 45 minutes..turned it off.
After about an hour, engine has been off and shore power disconnected, I measured voltage at each large terminal on trombetta and voltage was equal at about 11 volts.. Why is this?
I then started the engine and measured both posts again.. both 13 volts. Why is this?
Also, after turning the engine off, turning ignition on but not starting, I can now hear the trombetta solenoid clicking when I depress the Emergency Start switch..
Why is this? And why not when chassis battery completely dead.. House batteries are DEFINITELY charged and should have engaged the solenoid..
__________________
1998 Chieftain - sold
2012 Tiffin Allegro Open Road gas 36LA - Sold
2015 Thor Vegas 24.1
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