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Old 01-11-2019, 12:35 PM   #1
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MSG Chuck's Avatar
Newmar Owners Club
Join Date: Sep 2013
Posts: 18
Chassis battery charging issue

My 03 DS is not charging the chassis batteries while generator is running. The battery assist button has not worked since I bought the coach 5 years ago. Iíve been charging with an external charger when needed after generator is running. Any ideas where I need to look for problems would be appreciated.

MSG Chuck, Almost full time
03 Dutch Star M4005, ISC, Allison 6 speed, Spartan
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Old 01-11-2019, 01:34 PM   #2
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The Bi-directional relay would control both of those situations. Newmar has used a few different models. I believe recently, they switched to the Precision Circuits



I'm not sure where yours is hidden. Mine is on the aft wall of the electrical cord bay...hidden by a plastic partition.

Take a photo of your model number and check thier website. They usually have troubleshooting guides to help you.

It is probably shot...so carefully label the wires...and replace it with a new one.

They are great when they work...unfortunately, when they don't it only becomes apparent when the batteries get discharged.
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Charlie & Ronni
2016 Ventana 4037
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Old 01-11-2019, 01:39 PM   #3
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Location: Wellington, Florida
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Hi MSG Chuck,
The chassis batteries are charged (when the engine is not running) via the BIRD. It is located in the basement bay with the electric cord. It will be behind a black plastic cover on the rear wall. Pull on the cover and it will come forward and off. It is a bit tricky to determine when the BIRD will or will not charge the chassis batteries. When the coach batteries are fully charged the BIRD will link both coach and chassis batteries so they will both charge. If the coach batteries do not have a full charge, the chassis batteries will not be charged. These comments are for when the power comes from shore or generator source.
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Old 01-11-2019, 02:33 PM   #4
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Location: Albuquerque NM
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We have a Bay Star with a BIRD system. I have spent sometime on this system when we had battery charging issues.I replaced a charging solenoid in the BIRD to repair our problem.

Found info on the threads here and on line. I have a gauge on both chassis and house battery. I found that we have to travel at least a half hour before the BIRD will start to charge the house battery. When we use the generator about the same half hour to charge the chassis battery. I am sure the condition of your batteries will have a affect on the time to start charging.
John & Diane
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Old 01-11-2019, 02:39 PM   #5
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The bi-directional charging is thru the same solenoid as the boost circuit. It closes by the BIRD controller and by the dash switch.

If the boost doesn't work, there is a good chance that there is no charging between the house and chassis battery banks.

Even if the solenoid clunks in, its probably not connecting internally.

Common problem.
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Old 01-12-2019, 11:55 AM   #6
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Chassis battery charging issue

As usual, all of the responses have helped tremendously I will get one of these on order immediately and let yíall know how it works out. Thanks so much from sunny Key West.

MSG Chuck, Almost full time
03 Dutch Star M4005, ISC, Allison 6 speed, Spartan
Audi A4 Cabriolet Toad
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battery, charging, chassis

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