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Old 11-04-2020, 12:38 PM   #1
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Brand: Thor Motor Coach
Model: Windsport 27K
State: Kentucky
Posts: 754
THOR #2817
27K Engine alternator not charging coach batteries

I have a Windsport 27K. The coach batteries no longer charge when the engine is running. I imagine that there is an isolating device that is faulty, but I don't know what it looks like or where it's located.
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Old 11-04-2020, 01:00 PM   #2
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THOR #1469
If you do a forum search on BIRD, BIM and Trombetta you will quite a bit of info on this very topic.

You can start by looking at the post in these search results links.

https://www.thorforums.com/forums/se...archid=3467913

https://www.thorforums.com/forums/se...archid=3467915

https://www.thorforums.com/forums/se...archid=3467919

BIRD = Battery Isolation Relay Delayed
BIM = Battery Isolation Module
Trombetta = manufacturer of the relay most commonly used
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Old 11-04-2020, 02:42 PM   #3
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THOR #16471
Quote:
Originally Posted by EA37TS View Post
If you do a forum search on BIRD, BIM and Trombetta you will quite a bit of info on this very topic.

You can start by looking at the post in these search results links.

https://www.thorforums.com/forums/se...archid=3467913

https://www.thorforums.com/forums/se...archid=3467915

https://www.thorforums.com/forums/se...archid=3467919

BIRD = Battery Isolation Relay Delayed
BIM = Battery Isolation Module
Trombetta = manufacturer of the relay most commonly used
NONE of the links worked for ME.
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Old 11-04-2020, 02:50 PM   #4
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Model: ACE 27.1
State: Florida
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THOR #7035
Quote:
Originally Posted by Metalman View Post
I have a Windsport 27K. The coach batteries no longer charge when the engine is running. I imagine that there is an isolating device that is faulty, but I don't know what it looks like or where it's located.
Your 27K should be just like my 27.1

You have a Trombetta relay controlled by the BIRD circuit. The Trombetta relay is in the battery compartment towards the inside mounted on a bracket up high. It looks like this:

The main contacts are probably burnt open.

Trombetta is a brand name, you need a continuous duty low current relay to replace it if found bad. This is what I replaced mine with over a year ago:

https://www.amazon.com/gp/product/B072MZHK48/
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Old 11-04-2020, 05:42 PM   #5
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THOR #16471
More reading if you are interested.
https://www.thorforums.com/forums/f8...ing-16672.html
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Old 11-04-2020, 06:03 PM   #6
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Originally Posted by OldWEB View Post
More reading if you are interested.
https://www.thorforums.com/forums/f8...ing-16672.html
Thanks for the link to the thread. Excellent information, including schematics and a chart.
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Old 11-04-2020, 07:11 PM   #7
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Brand: Thor Motor Coach
Model: Hurricane 32N
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Here's a thread you might be interested in. I suggest an upgraded relay since these fail so often.

https://www.thorforums.com/forums/f8...ion-21620.html
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Old 11-04-2020, 09:34 PM   #8
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Originally Posted by OldWEB View Post
More reading if you are interested.
https://www.thorforums.com/forums/f8...ing-16672.html

Thanks for the Information!
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Old 11-04-2020, 09:59 PM   #9
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Originally Posted by reminckv View Post
Here's a thread you might be interested in. I suggest an upgraded relay since these fail so often.

https://www.thorforums.com/forums/f8...ion-21620.html
Thanks for the information. I just order one on eBay. I will relocate the solenoid from behind the batteries on the floor of the compartment where it can't be seen, to the wall, where I will have good access to it. What is wrong with Thor, lazy or stupid?
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Old 11-05-2020, 01:14 AM   #10
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Model: Hurricane 32N
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Originally Posted by Metalman View Post
Thanks for the information. I just order one on eBay. I will relocate the solenoid from behind the batteries on the floor of the compartment where it can't be seen, to the wall, where I will have good access to it. What is wrong with Thor, lazy or stupid?
You’re welcome. I relocated mine too. I think they like to play “hide and seek”.
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Old 11-16-2020, 01:20 PM   #11
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Thanks to everyone who responded to my post. I made a bracket to mount the new isolator (White Rogers 15V, 200-600 Amp.). It is now located where it can be seen, metered, and replaced without removing the batteries.
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Old 11-18-2020, 04:53 PM   #12
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I dissembled the faulty Trombetta relay and it appears that moisture caused corrosion on the contacts, resulting in a high resistance situation. I can understand how moisture could get into unit, since it was mounted on the bottom of the battery compartment not far from various openings that could allow water to enter when driving through heavy rain. The coil was still intact and operating, but there was no continuity between the two heavy terminals.
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Old 11-18-2020, 08:02 PM   #13
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WOW! That is corroded.

I do love it when people dissect the problem to the root, hopefully getting the proper answer. As weatherproof as it looks, you can never be certain.
Hopefully you cleaned this one up, reseal it (properly) and keep it for an emergency spare... it actually looks in fine shape otherwise.
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