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Old 11-01-2018, 08:01 PM   #15
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Originally Posted by Jeff00NTW View Post
Great. thanks for the info. Is there a device that can be used when the engine is running that the alternator will also charge the house batteries while it is charging the chassis batteries? The main problem I see is that my house batteries are agm batteries compared to the normal chassis batteries.
Many MHs have AGM and Flooded battery banks and interconnect them all of the time. You will be fine.

Your MH should already charge the house bank from the chassis battery. Check the solenoid.
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Old 11-02-2018, 05:21 PM   #16
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Wait a minute before checking voltage at banks after plugging in. The solenoid on mine doesn't switch over for several seconds, and you can definitely hear it switch. It should also switch if you hit the emergency start on the dash. If you don't hear the click, it's probably not working.
I got mine from O'reilly for $40. It is the OE solenoid. They had one for $19 but I don't want to have to change it every year so I got the name brand.
Both banks charge on mine whether on the alternator or plugged in.
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Old 11-09-2018, 08:21 PM   #17
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Quote:
Originally Posted by Jeff00NTW View Post
Great. thanks for the info. Is there a device that can be used when the engine is running that the alternator will also charge the house batteries while it is charging the chassis batteries? The main problem I see is that my house batteries are agm batteries compared to the normal chassis batteries.
Don't pay much attention to the guys posting if they don't have a National RV, as they don't know how Nationals work. Itasca, Winnebago, Damon and many others don't work like a National does. The BCC in a National is different and they work different than most others. IF the BCC is working correctly, and IF the isolation solenoid IS working correctly, it should charge both sets of batteries in either direction. There is a comparitor circuit on the BCC that looks at both sets of batteries. When the chassis battery gets to 13.2 volts the solenoid should close and charge the house batteries, IF the solenoid is good. Same way on the house batteries when plugged in. When the house batteries get to 13.2 volts the solenoid should close and charge the chassis battery, IF the solenoid is good. NOW if there is any burned parts on the BCC board, it may NOT work. If you have a bad cell in one of those batteries it may never reach 13.2 volts, and will not switch.

My 03 Dolphin has a couple burned capacitors on the BCC and will NOT charge the house batteries from the alternator, nor charge the chassis battery from the converter. A new BCC is over $600.00, and they don't sell the circuit boards by themselves. the company will send you a schematic for the BCC and you can trouble shoot it. I don't have that info anymore as I went thru this with my BCC in early 2017. Hint, those solenoids do go bad as they are activated a lot of the time. Make sure you use the correct one if you do change it, it's a lot of work.
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Old 11-11-2018, 04:29 PM   #18
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Two questions BCC ? What is it and where.
Also where is this solenoid located and how do you check it
My coach is a 7273 national tradewinds. (yr.2000)
Thank friends
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Old 11-11-2018, 06:27 PM   #19
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Have someone push the boost switch repeatedly while you listen for it clunking.

You " special " National BCC works the same as any BIRD or BIM.

It senses charging voltage bi-directionally and closes a solenoid.

If your BCC is burnt out, a BIRD can be wired in to take over the control duties.

https://www.intellitec.com/index.php...tery_charging/

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Old 11-11-2018, 08:53 PM   #20
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Two questions BCC ? What is it and where.
Also where is this solenoid located and how do you check it
My coach is a 7273 national tradewinds. (yr.2000)
Thank friends
BCC= Battery Control Center. On my 03 Dolphin it is in the compartment right behind the passenger front tire. Here is what mine looks like, some newer units looked similar but had many more circuit breakers where mine has fuses. The solenoid is between the 2 circuit boards. Kind of a pain to change it out.
Here is a link from a thread from a while back, on page three there is some pdf files for the Custom Products BCC. The board in these files is a smaller type but they work pretty close to the same.
http://www.irv2.com/forums/f105/emer...ch-361019.html
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Old 12-08-2018, 02:41 PM   #21
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Thanks Charlie
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Old 12-09-2018, 12:35 AM   #22
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To the OP and others with National RV's. If you do not have the documentation/troubleshooting guide for your BCC call RV Custom Products and ask for it. They will email it to you. National RV installed in their RV's a BCC that will charge the chassis and house batteries if the BCC and interconnect solenoid are operating correctly. This is on shore, generator, or engine alternator.

RV Custom Products
14000 Anson Ave, Santa Fe Springs, CA 90670
(562) 921-8353
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Old 12-09-2018, 11:14 AM   #23
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Hello,

Sorry it has been a while about posting back. Thanks everyone for the info.

It was the solenoid behind the bcc. Purchased a new from NAPA and works perfect now.

One thing to mention is that I took pictures of everything to make sure it was put back together correctly.

Thanks again
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Old 12-10-2018, 08:38 AM   #24
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Thanks so much.I just called them they are very pleasant and are sending me this info via email. Life is good
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