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12-15-2017, 06:10 PM
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#1
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Junior Member
Join Date: Nov 2015
Posts: 23
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Battery isolation manager
Yesterday I finally figured out why my coach would not charge the chassis batteries when plugged into shore power. This has been a problem since the coach was new and did not bother me since we moved about enough for the engine alternator to charge the batteries. I was advised to replace the BIM and started to do so. When I unhooked all the wires , I found that the chassis lead and the house leads were reversed. Such a simple mistake by Newmar has driven me crazy over the last year and a half. Has any one else had this problem? My coach has been trouble free other than this.
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Tom and Melanie
2016 Ventana LE
East Berlin, PA
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12-15-2017, 06:26 PM
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#2
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Now that's interesting TOM we have for pass week been discussing your battery problem on this other thread, we will just have to add your find to it.
In fact I have a couple of threads to add it too.
So now you have a spare B.I.M. are the cables that are reversed marked as to where they go or did you trace them out?
I will be notifying Newmar of your find we have had many members with no chassis battery charging, maybe a TSB will be issued.
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12-16-2017, 07:01 AM
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#3
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Junior Member
Join Date: Nov 2015
Posts: 23
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Thanks for spreading the word. I sent the new BIM back to Newmar yesterday. I did not mark the leads on the cables. The rest of the story is, I had to mount the BIM upside down! The cables come through the box side by side and are sealed off with some sort of very tough sealant which I could not even budge. There was not enough slack to cross them over.
Thanks for all you do on the forum to help us all!
__________________
Tom and Melanie
2016 Ventana LE
East Berlin, PA
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12-16-2017, 02:14 PM
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#4
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Thanks for the explain on what you had to do, you may have solved a lot of frustrations for people.
Safe travels.
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12-16-2017, 07:59 PM
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#5
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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When you say you did not mark the cables to identify them, did you have them disconnected for some reason, before pulling BIM out or were they the cables installed in reverse by the factory????
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12-17-2017, 08:44 AM
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#6
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Junior Member
Join Date: Nov 2015
Posts: 23
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They were reversed at the factory. The cables were sealed around the bulk head penatration with a very tough sealant.
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Tom and Melanie
2016 Ventana LE
East Berlin, PA
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12-17-2017, 08:57 AM
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#7
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Hmm .... wouldn't the BIM work anyway? .... maybe just not in the same order of which bank charged first. I guess we'd need a pic of the original wiring.
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2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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12-17-2017, 08:57 AM
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#8
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by Fleet
They were reversed at the factory. The cables were sealed around the bulk head penatration with a very tough sealant.
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Good Work.
Nothing like getting down and dirty. All the armchair internet techs are great but nobody would even dream of your scenario.
Did you happen to let Mr. Newmar know? I'm sure he would be interested as I'm also sure yours is not alone.
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2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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12-17-2017, 10:27 AM
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#9
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Quote:
Originally Posted by bruceisla
Hmm .... wouldn't the BIM work anyway? .... maybe just not in the same order of which bank charged first. I guess we'd need a pic of the original wiring.
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The problem was his chassis battery would not charge off the Alternator or converter with cables reversed.
It screwed up the BIRD or B.I,M, as to what it was suppose to do.
I guess the house batteries were charging he didn't say.
I will be notifying Newmar of this problem maybe they will issue a TSB.
Many have had this chassis battery problem especially the gas coach's.
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12-17-2017, 12:29 PM
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#10
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by "007"
The problem was his chassis battery would not charge off the Alternator or converter with cables reversed.
It screwed up the BIRD or B.I,M, as to what it was suppose to do.
I guess the house batteries were charging he didn't say.
I will be notifying Newmar of this problem maybe they will issue a TSB.
Many have had this chassis battery problem especially the gas coach's.
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I can only assume the Coach sense wire is on the Chassis Bank. Easy to swap on a BIRD but harder on a BIM with it's strap instead of a wire.
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2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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12-17-2017, 01:41 PM
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#11
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D333RLT Tower
Texas Boomers Club Entegra Owners Club
Join Date: Jun 2009
Posts: 2,075
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My B. I. M. went belly up in previous coach (Cornerstone). Of course the mobile guy and CS said I just needed new chassis batteries. They were wrong and I paid the bill for their mistake. New batteries promptly went dead.
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[COLOR=red]2022 KZ Durango D333RLT
[FONT=Arial][COLOR=red] Towed by2022 F-250 Lariat 7.3 Godzilla gas 10 speed , Texas Boomers RV Club
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12-17-2017, 04:11 PM
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#12
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Senior Member
Join Date: Feb 2012
Location: Bella Vista, Arkansas
Posts: 5,384
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Quote:
Originally Posted by Fleet
Yesterday I finally figured out why my coach would not charge the chassis batteries when plugged into shore power. This has been a problem since the coach was new and did not bother me since we moved about enough for the engine alternator to charge the batteries. I was advised to replace the BIM and started to do so. When I unhooked all the wires , I found that the chassis lead and the house leads were reversed. Such a simple mistake by Newmar has driven me crazy over the last year and a half. Has any one else had this problem? My coach has been trouble free other than this.
Attachment 185843Attachment 185843
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Where is this mounted at and how would I tell if the wiring was reversed?
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Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT 4X4
2024 Grand Design Reflection 296RDTS
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12-18-2017, 08:00 AM
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#13
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Junior Member
Join Date: Nov 2015
Posts: 23
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The BIM works by monitoring the voltage of the coach, house voltage. At 13.2 volts the BIM will pull in the solenoid and charge both sets of batteries. Since the chassis was reversed on the BIM the monitoring was looking for 13.2 on the chassis bank which never got to 13.2 volts because there was no direct connection to the charger which was charging only the coach side. When the coach was running its motor, the chassis batteries were getting it charge from the alternator.
__________________
Tom and Melanie
2016 Ventana LE
East Berlin, PA
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12-18-2017, 08:03 AM
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#14
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Junior Member
Join Date: Nov 2015
Posts: 23
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I did let customer service know what happened and they said they would let tech know
__________________
Tom and Melanie
2016 Ventana LE
East Berlin, PA
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