Go Back   Thor Forums > Thor Tech Forums > Maintenance and Repair
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 02-04-2020, 09:08 PM   #1
FEZ
Member
 
Brand: Thor Motor Coach
Model: Miramar
State: Ohio
Posts: 48
THOR #7381
BIM (Battery Isolation Manager) Question

Hi All,
Quick question, I have a 2017 Thor Miramar and I have replaced my chassis battery back in December '18 and now that battery has gone dead too but is still rechargeable. I'm 99% sure the BIM is bad. So my question to the group is, what can drain a battery besides an alternator and BIM? Also, this fall when I went to put it in storage I had to jump the battery and drove it for 15-20 minutes to my storage area and week later I was able to start it without jumping/charging it. This leads me to believe the BIM is bad. Any thoughts? Thanks in advance!
__________________

__________________
FEZ is offline   Reply With Quote
Old 02-04-2020, 09:22 PM   #2
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 3,781
THOR #7035
Alternators charge batteries.
BIMS connect two batteries (or battery banks) together when one side is charging and separate them when neither side is charging.

A BIM with an internal short MAY discharge a battery.
An Alternator with an internal short MAY discharge a battery.
Anything connected to the DC buss will discharge a battery if energized.
Anything connected to a DC buss MAY discharge a battery if faulty.

Does that answer your wide open question?
__________________

__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 02-04-2020, 09:31 PM   #3
FEZ
Member
 
Brand: Thor Motor Coach
Model: Miramar
State: Ohio
Posts: 48
THOR #7381
I know what each part does, but thanks. I just want to know if anyone else has experience almost the same thing and did a BIM cure the issue. Trying not to chase something forever. Thanks!
__________________
FEZ is offline   Reply With Quote
Old 02-04-2020, 09:43 PM   #4
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 3,781
THOR #7035
Put an ammeter on your chassis battery with everything turned off. The only draw would be in milliamps for maybe the memory in the radio. If you have more than that lift the lead on one suspected component at a time to see if the draw stops. If your case the BIM and or the alternator. If neither one of them are the culprit then it's a major guessing match. I'd move on to the major fuses and relays in the fuse box next.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 02-04-2020, 09:47 PM   #5
FEZ
Member
 
Brand: Thor Motor Coach
Model: Miramar
State: Ohio
Posts: 48
THOR #7381
I will attempt that. Hopefully I will figure it out quickly. Thanks.
__________________
FEZ is offline   Reply With Quote
Old 02-04-2020, 09:55 PM   #6
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 3,781
THOR #7035
Wish I could be more help and I hope it's not an intermittent problem. You can't fix it if you can't see it.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
16ACE27 is offline   Reply With Quote
Old 02-04-2020, 11:20 PM   #7
Senior Member
 
halfprice's Avatar
 
Brand: Thor Motor Coach
Model: Hurricane 29M
State: California
Posts: 2,475
THOR #3156
Call the bim manufacturer info below.

The bim has a 5 year warranty. A tech will walk you through several tests to determine if the bim is the problem

To do the tests you'll need a volt meter and access to the bim. For me that meant crawling under the mh to gain access

The tech was very helpful and my bim was not bad but he helped solve my problem

Jerry
Click image for larger version

Name:	Screenshot_20200204-161656_Chrome.jpg
Views:	33
Size:	32.6 KB
ID:	22449
__________________
https://www.thorforums.com/forums/f2...mods-4609.html
Jerry, Maria, and Sasha 6lb Yorkie
2017 Thor Hurricane 29M
2016 Jeep Wrangler Unlimited Sport
FMCA # F464385
halfprice is offline   Reply With Quote
Old 02-04-2020, 11:36 PM   #8
Site Team
 
revjeffrey's Avatar
 
Brand: Thor Motor Coach
Model: Axis 24.1 Windjammer
State: Illinois
Posts: 1,179
THOR #7074
I did exactly as Jerry said above. Mine was bad. All good now. I still disconnect batteries if I will not be using rig.
__________________

__________________
Rev. Jeffrey 2017 Thor Axis 24.1 E450 Windjammer.
Silver Safe-T-Plus Steering Control
SSF-106-40 SumoSprings Solo Front Bump Stop SSR-107-47 SumoSprings Rear Bump Stop
Hellwig 7718 Front Sway Bar & 7180 Rear Sway Bar
Koni FSD Front Shocks 8805-1042 / Koni FSD Rear Shocks 8805-1043
revjeffrey is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 06:01 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
×